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Why were ousia and hypostasis synonymous in the Nicene Creed?

In the original 325 A.D. Nicene Creed, an anathema is included which has ousia and hypostasis as synonymous. In this case, the Trinity is one hypostasis ( = homoousios).

And in the Holy Spirit. But as for those who say, There was when He was not, and, Before being born He was not, and that He came into existence out of nothing, or who assert that the Son of God is of a different hypostasis or substance (ὑποστάσεως ἢ οὐσιάς) or created, or is subject to alteration or change these the Catholic and apostolic Church anathematizes.

Source: https://earlychurchtexts.com/public/creed_of_nicaea_325.htm

It seems also the meaning of υποστασις in Hebrews 1:3.

He is the radiance of the glory of God and the exact imprint of his nature (υποστασις) (ESV). The ASV has "substance".

However, in later centuries hypostasis began referring to the "person", not the "nature" or "being" of the Trinity. Why did such change in definition occur? It would be helpful to address the semantical development of υποστασις on how it changed from "substance" (nature/essence) to "person".

The Church confesses is that God is three Persons (hypostasis) in one Essence (ousia).

Source:

https://www.google.com.ph/amp/s/exploringthedepthsofthedivine.wordpress.com/2015/08/12/god-as-trinity-orthodox-trinitarianism/amp/

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This response has been extracted from a longer article of mine on the subject (linked at the end) , hence the discontinuous numbering of its sections.

1. Ousía in Greek philosophical discourse

Deriving then from the verb "to be", as we can see in [4] ousía enters the Greek philosophical discourse with Plato, who uses it to mean the primary, fundamental kind of being, ("prōtē ousíā", pl. "prôtai ousíai"), with Aristotle afterwards using it with the same meaning. It is crucial to note that, for both Plato and Aristotle, ousía does not enter the discourse as a definition but as a question to be answered: what is the primary, fundamental kind of being? What is prōtē ousíā?

While ousía means the same for both Plato and Aristotle as a question, they provide completely different answers to that question. Plato's answer is well known: the Form, which exists in a transcendent world of Forms, is prōtē ousíā, the primary, real being, of which the particular objects in the sensible world are just shadows. Against this Platonic background, Aristotle then provides his own answer in two works, Categories and Metaphysics, in which, notably, he provides different answers.

Categories, part 5 [6]

  • Primary ousía is the individual, particular, concrete entity, of which species and accidents can be predicated without it being predicable of or attributable to anything else. This is actually stated in negative terms: “what is neither in a subject nor said of a subject”, i.e. the particular subject itself or "hypokeimenon" [7], literally “that which underlies or lies beneath” the universals (first of all species and genus) in which it falls and the accidents which inhere in it.

  • Secondary ousía ("deutérā ousíā", pl. "deúterai ousíai") is the species (first of all) and the genus to which the particular subject belongs.

Metaphysics, book VII/Zeta [8]

  • Primary ousía is the essence of the particular entity, which is its form, while the particular entity, the composite of form and matter, is ousía in a derivative sense. (The Aristotelian expression that the Latins translated as "essentia" is "to ti ên einai", "the what it was to be", although sometimes he uses the shorter expression "to ti esti", "the what it is".)

  • Species and genus are not ousía.

A question arises at this point: Is for Aristotle the form of a particular entity a particular or a universal? This, in conjunction with his statement in Z.13 that no universal is ousía, is the most disputed issue regarding Aristotle's Metaphysics, and has given rise to a whole field of Aristotelian exegesis, in which the main lines are [9] [10]:

  • Forms are not universal, and each particular entity has its own form which resides in that entity, so that all individuals of a given species have forms which are identical to one another but numerically different.

  • Forms are universal, and Z.13 actually does not exclude them as ousía.

Since the second line is basically a reversion to Platonism, IMO it is extremely implausible that it may reflect Aristotle's personal position.

Summarizing the answers that Aristotle gives to the question "What is primary ousía?":

  • Categories: the particular entity or "hypokeimenon", the subject which underlies all predicates and cannot be predicated of anything else.

  • Metaphysics: the essence of the particular entity, which is its form, which may be understood in a particular or a universal sense.

2. Hypostasis, the original cognate of substantia

Etymologically [1] [2],

hypostasis = hypó ("under") + stásis ("a standing" = (hístēmi ("to stand") + -sis, verbal noun suffix)) = "that which stands under"

is a direct cognate of [3] [4] [5] [6]:

substantia = sub ("under") + stans ("standing", present active participle of stō ("stand")) = "that which stands under".

According to [7], the first recorded use of hypostasis as "substance" was in the book "On the cause of plants" by Aristotle's successor Theophrastus (c. 371 - c. 287 BC), while the term may have been introduced in the philosophical discourse either by the Stoic Poseidonius (c. 135 BC - c. 51 BC) according to some, or by the Epicurean Demetrius Lacon (fl. late 2nd century BC) according to others, in both cases with the meaning of objective or concrete existence or reality. Thus, real entities were said to "have hypostasis", whereas merely apparent or imaginary entities did not.

Recalling at this point that both the Stoic and the Epicurean philosophical schools were materialistic, the first conceiving the all-pervading Logos as a subtle fiery aether and the second conceiving reality as consisting just of atoms and void, it is clear that, to the extent that they used the term ousía, they would not have used it in the sense of form understood as universal or even in the sense of form at all, but in the sense of the individual, particular, concrete entity, the "hypokeimenon", “that which underlies or lies beneath”, which clearly overlaps with the meaning of hypostasis. Therefore, it is clear that for both Stoics and Epicureans the terms ousía and hypostasis were synonyms, but that was due to the specific sense in which both schools understood ousía.

Introducing now the Latins, who were now becoming interested in philosophy, into the picture:

Since, per linguistic design, substantia = hypostasis,

and, per Stoic and Epicurean understanding of ousía, hypostasis = ousía,

then, for the Latin-speaking Stoic- and Epicurean-dominated culture, substantia = ousía.

This was precisely the case of Tertullian, who was heavily influenced by Stoic metaphysics and coined the formula "tres Personae, una Substantia" early in the III century, after which substantia came to mean, among Latin-speaking Christians, the single infinite spirit that the Father, the Son and the Holy Spirit have in common, which is the meaning of ousía in the Nicene sense, as we will see next.

5. The "one ousía" answer to Arianism, its modalistic and tritheistic risks, and Nicaea's "one hypostasis" as prevention of the second.

Since Arians denied that the Son and the Father were one, they had to interpret Jesus' words "I and the Father are one." (Jn 10:30) in the sense of only moral oneness and not ontological oneness. To counter that eisegesis, the orthodox sought for the right word to add to Jn 10:30 to convey unequivocally the sense of ontological oneness: "I and the Father are one"... what?

We arrive at the same question from four key statements by Jesus of his divinity that were not mentioned in the previous section: the 4 times in which He explicitely applied to Himself the divine Name in the first person revealed in Ex 3:14: "Ehyeh", "Ego Eimí", I Am": Jn 8:24,28,58 & 13:19. If each of the Father and the Son names Himself "Ego Eimí", "I Am", then Each is a distinct "I" but Both are the same... what?

The natural answer to that question was the term ousía, which derived precisely from the verb "eimí", "to be". So, the initial orthodox answer to the Arian challenge was: the Father and the Son are one ousía and two prósōpa, one being and two persons. Now, each term in that answer, ousía and prósōpon, was at risk of misinterpretation resulting in another heresy.

The risk of misinterpretation of ousía came from the fact that the philosophical stage at the beginning of the IV century was very different from that of around 70 AD when the Letter to the Hebrews was written. Platonism had come back with Plotinus (204-270) and Porphyry (234-305), and with it the notions of forms and universals and therefore the issue of the exact meaning of ousía. Let us recall from section 1 that ousía had entered the philosophical discourse, some 700 years before Nicaea, not as a definition but as a question to be answered, and for which Aristotle had provided two different answers, one in the Categories and another in the Metaphysics, the second of which could in turn be interpreted in two different ways:

C: the individual, particular, concrete subject or "hypokeimenon", “that which underlies or lies beneath”;

M1: the essence or form, understood as particular;

M2: the essence or form, understood as universal.

Each of these senses of ousía led to a different sense of the statement that the Father and the Son were "homoousious", "of the same ousía":

C: They were the same particular, concrete subject.

M1: They had the same essence or form, understood as particular.

M2: They had the same essence or form, understood as universal.

It is easy to see that, while sense C amounts to modalism, sense M2 amounts to tritheism, since the case would be the same as stating that three horses have the same essence or form. It was probably to prevent the risk of understanding ousía as a universal of which there were multiple instances, or equivalently, of understanding the expression "of the same ousía" in the sense of only qualitative identity instead of numerical identity, that the Nicaea fathers added hypostasis - which, as we saw in section 2, had the meaning of objective or concrete existence or reality - as synonym of ousía, anathematizing those who asserted that the Son of God "is of another hypostasis or ousía" [1] [2]. Since substantia was originally the cognate and equivalent of hypostasis, making hypostasis equivalent to ousía (M1) reinforced the Western understanding of substantia as the Latin equivalent of ousía (M1) that had begun with Tertullian.

Whereas the addition of hypostasis as synonym of ousía effectively prevented the M2 sense of ousía as universal, which leads to tritheism, it in effect promoted the C sense - which is evident from the etymological equivalence of hypostasis, literally "that which stands under", with hypokeimenon - which leads to modalism.

Which takes us precisely to the risk of misinterpretation of prósōpon, which came from the fact that it meant "face", "mask" or "character in a theatrical play" [3]. Thus modalists could claim that they were in complete agreement with the definition of Nicaea.

6. The three Hypostases formula: appearance, toleration by St. Athanasius and resistance by St. Jerome.

As noted in section 3, the use of hypostasis as synonym of ousía, so that the Father and the Son were said to be "of the same hypostasis", was inconsistent with the sense of hypostasis in Heb 1:3, since that passage necessarily implies - from the very notion of "charaktēr" as impressed image or copy, reproduction, representation - that the Son is or has a numerically different hypostasis from that of the Father, irrespective of what hypostasis may mean.

It was not this consideration, however, what motivated orthodox theologians to advocate formulating trinitarian doctrine in terms of three hypostases, but the realization that using all the terms that can convey a sense of objective reality - i.e. hypostasis and ousía - to denote the common being of the Father and the Son amounted to leaving the door open for modalists to claim that they were in full agreement with the dogmatic definitions of the Church.

The notion of three Hypostases had been introduced in Christian theology by Origen and had been used also by his former student St. Dionysius of Alexandria. Its first documented use after Nicaea was by (also Alexandrian) St. Athanasius, in his work "In Illud Omnia", written probably c. 335 [1] [2]:

"For the fact of those venerable living creatures [Isa 6:3; Rev 4:8] offering their praises three times, saying 'Holy, Holy, Holy,' proves that the three Hypostases are perfect, just as in saying 'Lord,' they declare the one Ousía."

After that, the expression was not used again by St. Athanasius, in deference to the anathema of Nicaea [1], but was used by non-Nicene bishops, e.g. in the Dedication creed of the council of Antioch of 341 and in a letter by the homoiousian bishop George of Laodicea in 359. But by the time of the Council of Alexandria of 362, presided by St. Athanasius, the expression was already being used by people holding homoousian orthodoxy, as attested by the letter to the Church in Antioch written by that Council, known as "Tomus ad Antiochenos" [3] [4], which acknowledged that both expressions, "three hypostases" and "one hypostasis", could used in a sense consistent with homoousian orthodoxy.

In stark contrast with St. Athanasius in the Council of Alexandria of 362, St. Jerome, in his epistle 15 to Pope St. Damasus, written in 376 or 377 [5] [6] [7], manifests his deep trouble with the use of the formula "three hypostases".

7. The three Hypostases formula: proposal by St. Basil and St. Gregory of Nyssa and increasingly official Church adoption since 382.

After Nicaea, the first orthodox theologian to propose a notion of hypostasis distinct from that of ousía in a published work was St. Basil of Caesarea (330-379), and he does it in his epistles 214 (375) to Count Terentius [1] and 236 (376) to Amphilochius [2]. In both letters, the main motive for using hypostasis as synonym of Person is that, if the orthodox keep speaking of one hypostasis, they set the stage for the Arians to accuse them of Sabellianism (modalism).

St. Gregory of Nyssa (335-394) devotes his epistle 35 (c. 380) addressed to his brother Peter - which is often referred to as St. Basil's epistle 38 to his brother Gregory - to the difference between ousía and hypostasis. St. Gregory starts by distinguishing between the common or general and the particular, and provides a definition of hypostasis [3].

In 381, i.e. around one year after Gregory's letter to Peter, the second Ecumenical Council convened in Constantinople, and the next year, i.e 382, a synod of bishops assembled in that city and sent a Synodical Letter to Pope Damasus and other Western bishops, which is the first official (though not ecumenical) Church document speaking of three Hypostases [4]:

Letter from the Constantinople Synod of 382 to Pope Damasus

What we have undergone — persecutions, afflictions, imperial threats, cruelty from officials, and whatever other trial at the hands of heretics — we have put up with for the sake of the gospel faith established by the 318 fathers at Nicaea in Bithynia. You, we and all who are not bent on subverting the word of the true faith should give this creed our approval. It is the most ancient and is consistent with our baptism. It tells us how to believe in the name of the Father and of the Son and of the Holy Spirit: believing also, of course, that the Father, the Son and the Holy Spirit have a single Godhead and power and substance, a dignity deserving the same honour and a co-eternal sovereignty, in three most perfect Hypostases, or three perfect Persons. So there is no place for Sabellius’s diseased theory in which the hypostases are confused and thus their proper characteristics destroyed.

End of quote from the Constantinople Synod of 382.

In 431 the third Ecumenical Council convened in Ephesus. The third letter of St. Cyril of Alexandria to Nestorius, which was read at the council and included in the proceedings, spoke of the Hypostases of the Word and of the Holy Spirit [5]:

St. Cyril of Alexandria, in his 3rd letter to Nestorius

All the expressions, therefore, that occur in the gospels are to be referred to one Person, the one enfleshed Hypostasis of the Word.

For even though the Spirit exists in his own Hypostasis and is thought of on his own, as being Spirit and not as Son, even so He is not alien to the Son.

End of quote from St. Cyril.

In 451 the fourth Ecumenical Council convened in Chalcedon and proclaimed a Christological definition which contains all the terms considered so far: ousía, prosopon, hypostasis, and nature [6] [7].

Finally, in 553 the fifth Ecumenical Council convened in Constantinople and proclaimed a series of trinitarian and Christological definitions, the first of which explicitely identifies ousía with physis and hypostasis with prosopon [7].

References

Section 1

[4] https://en.wiktionary.org/wiki/%CE%BF%E1%BD%90%CF%83%CE%AF%CE%B1

[5] https://en.wiktionary.org/wiki/%CE%BF%CF%85%CF%83%CE%AF%CE%B1

[6] Studtmann, Paul, "Aristotle's Categories", The Stanford Encyclopedia of Philosophy (Fall 2017 Edition), Edward N. Zalta (ed.) https://plato.stanford.edu/archives/fall2017/entries/aristotle-categories/

[7] https://en.wiktionary.org/wiki/hupokeimenon

[8] Cohen, S. Marc, "Aristotle's Metaphysics", The Stanford Encyclopedia of Philosophy (Winter 2016 Edition), Edward N. Zalta (ed.) https://plato.stanford.edu/archives/win2016/entries/aristotle-metaphysics/

[9] Loux, Michael J., "Primary Ousia: an essay on Aristotle's Metaphysics Z and H", Cornell University Press, 2008. https://books.google.com/books?id=1DOIpuLnrnIC

[10] Cohen, S. Marc, "Z.13: Substances and Universals", 2008. https://faculty.washington.edu/smcohen/433/Z13Lecture.pdf

Section 2

[1] https://en.wiktionary.org/wiki/%E1%BD%91%CF%80%CF%8C

[2] https://en.wiktionary.org/wiki/%CF%83%CF%84%CE%AC%CF%83%CE%B9%CF%82

[3] https://en.wiktionary.org/wiki/substantia

[4] https://en.wiktionary.org/wiki/sub#Latin

[5] https://en.wiktionary.org/wiki/stans#Latin

[6] https://en.wiktionary.org/wiki/sto#Latin

[7] Ute Possekel, "Evidence of Greek philosophical concepts in the writings of Ephrem the Syrian", Peeters Publishers, Louvain, 1999. https://books.google.com/books?id=rZ3gGQuJUS4C

Section 5

[1] http://www.earlychurchtexts.com/public/creed_of_nicaea_325.htm

[2] http://www.fourthcentury.com/urkunde-24/

[3] https://en.wiktionary.org/wiki/%CF%80%CF%81%CF%8C%CF%83%CF%89%CF%80%CE%BF%CE%BD

Section 6

[1] Thomas G. Weinandy, Athanasius: A Theological Introduction, Ashgate Publishing, 2007. https://books.google.com/books?id=SGOpA_MjSUgC

[2] https://www.elpenor.org/athanasius/in-illud-omnia.asp?pg=7

[3] Lewis Ayres, Nicaea and Its Legacy: An Approach to Fourth-Century Trinitarian Theology, Oxford University Press, Oxford, Oct 28, 2004. https://books.google.com/books?id=iT4VDAAAQBAJ

[4] http://www.newadvent.org/fathers/2818.htm

[5] The Letters of Saint Jerome, Aeterna Press, 2016. https://books.google.com/books?id=iTwIDAAAQBAJ

[6] http://www.newadvent.org/fathers/3001015.htm

[7] http://www.earlychurchtexts.com/main/jerome/jerome_ep_15_tres_hypostases.shtml For the quoted passage, I used this Latin text to improve the accuracy of the English translation in the previous two references.

Section 7

[1] https://www.elpenor.org/basil/letters-3.asp

[2] https://www.elpenor.org/basil/letters-3.asp?pg=39

[3] https://www.scribd.com/document/212698195/Letter-35

[4] http://www.papalencyclicals.net/councils/ecum02.htm

[5] http://www.papalencyclicals.net/councils/ecum03.htm

[6] Richard Price and Michael Gaddis, The acts of the Council of Chalcedon, Liverpool University Press, 2005. https://books.google.com/books?id=6IUaOOT1G3UC

[7] Pavouris, Raphael (2001), The condemnation of the Christology of the three chapters in its historical and doctrinal context: the assessment and judgement of Emperor Justinian and the Fifth Ecumenical Council (553). PhD thesis, University of Glasgow. http://theses.gla.ac.uk/1503/

Article from which the above has been extracted: http://ousiakaihypostasis.blogspot.com

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  • 3
    You have not included any references. Are the bracketed numbers references ? In which case could you include the source of the reference. please ?
    – Nigel J
    Jul 29 '20 at 20:48
  • Done. Thank you for pointing it out.
    – Johannes
    Jul 29 '20 at 22:14
  • I know the response is lengthy for this site, and that's precisely the reason why I originally left out the references, though your previous comment made me realize that they should be included. Now, I do not think it can be further shortened. Note that I left out the quotes from the Antiochene Tome, St. Jerome, St. Basil, St.Gregory and the Council of Chalcedon.
    – Johannes
    Jul 29 '20 at 22:54
  • The question IS about a "historical complication" of a philosophical and linguistic nature. If the subject is not explained adequately, it is not possible to understand why hypostasis was first used as a synonym of ousía in Nicaea and then as a synonym of divine Person from 382 onward, or why substantia, a direct cognate of hypostasis, ended up having the meaning of ousía.
    – Johannes
    Jul 29 '20 at 23:12
  • 3
    @Johannes No need to be defensive about long answers, we love long answers on complex topics here!
    – curiousdannii
    Jul 30 '20 at 1:28
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Purpose

The original Nicene Creed, formulated in the year 325 AD, in the condemnations at the end of it, denounces:

“Those who say … that the Son of God is of a different hypostasis (ὑποστάσεως) or substance (οὐσιάς)” (Early Church Texts).

"Substance" (οὐσιάς) is transliterated as ousia. In other words, according to the creed, the words hypostasis and ousia are synonyms and the Son of God is both of the same hypostasis as the Father and of the same ousia or substance as the Father. This causes the following anomalies:

(1) While, in the Creed, the Son is of the same hypostasis as the Father, in the Trinity doctrine, the Father and the Son are different hypostases (Persons).

(2) While the Creed uses hypostasis and ousia as synonyms, in the Trinity doctrine, hypostasis and ousia differ in meaning: The Father, Son, and Holy Spirit are three hypostases (Persons) but in one ousia (substance or being).

(3) By describing the Father and the Son as the same hypostasis and as the same ousía, the creed seems to teach Sabellianism (modalism), in which the Father, Son, and Holy Spirit are one Person (one mind and one will) wearing three faces or masks, like a single person playing three characters in a theatre. However, Sabellianism has already been rejected before the Nicene Creed was formulated.

To address these anomalies, this article discusses the original meanings of these words and how the meanings changed over time.

Original Meaning of Hypostasis

Etymology

Etymologically (i.e., relating to the origin and historical development of words and their meanings), ὑποστάσεως (hypostasis) is a direct cognate of οὐσιάς (substance) (See, Ousía and hypostasis from the philosophers to the councils). This means that these two words have the same linguistic derivation. Examples of other cognates are the English father, German Vater, and Latin pater. Originally, therefore, ὑποστάσεως (hypostasis) and οὐσιάς (substance) had the same meaning.

In Greek Philosophy

Both ousía and hypostasis, originally, meant "that which stands under." The ancient Greek philosophers used these terms to describe real entities as having substance - "the fundamental reality that supports all else," in contrast to imaginary entities:

“Hypostasis is the underlying state or underlying substance and is the fundamental reality that supports all else” (Hypostasis - Wikipedia)

In Hebrews 1:3

Hypostasis appears only once in the Bible, namely in Hebrews 1:3:

“His Son … is the exact representation of His (God’s) υποστασις (hypostasis).”

Although hypostasis, today, is commonly interpreted to mean “Person,” in this verse, it is translated as "substance" (ASV) or as “nature” (NASB). In this verse, therefore, hypostasis has the same meaning as it had for the ancient Greeks. Similarly, Strong's Greek: 5287 - ὑπόστασις (hupostasis) explains it as meaning “a support, substance, steadiness, hence assurance.”

How did the meaning change?

Since hypostasis originally meant "substance, nature, or essence," how and why did its meaning change to "person?"

The meaning of hypostasis did not change over time as a natural process of evolution in how the word was used. Rather, the meaning was changed as a result of an explicit proposal by one theologian that became generally accepted in the church as a means to interpret the Nicene Creed as to not teach Sabellianism. To explain this, we need to trace the history of this word:

First Three Centuries

In the first three centuries, Origen and other Christian writers used hypostasis in the same way as the Greek philosophers did before them, namely to denote "being" or "substantive reality." They used hypostasis as a synonym for ousia (substance). (Ramelli, Ilaria (2012). "Origen, Greek Philosophy, and the Birth of the Trinitarian Meaning of Hypostasis". The Harvard Theological Review. 105 (3): 302–350.doi:10.1017/S0017816012000120.JSTOR 23327679, p. 302-350.)

For a definition of ousia, see, for example, Homoousion - definition of Homoousion by The Free Dictionary or [οὐσία][8] in Liddell & Scott.

Nicene Creed - 325

As discussed above, this is also how hypostasis was used in the anathemas appended to the Nicene Creed.

Five decades after Nicaea

The meaning of hypostasis was changed during the five decades after Nicaea. The council added the word homo-ousios (same substance) on the insistence of Emperor Constantine (Jörg Ulrich. "Nicaea and the West." Vigiliae Christianae 51, no. 1 (1997), p15) [God in Three Persons, Millard J. Erickson][9], p82-85.

As indicated by the large number of creeds which the church fathers formulated in the 50 years after Nicaea (see [Arian creeds - Wikipedia][10]), particularly to find alternatives for the word homo-ousios (see [Fourth Century Arianism][11] or [Arianism - Wikipedia][12]), the church reacted quite strongly against the word homo-ousios:

At the time, one main argument against the word homo-ousios was, with respect to words such as "Latin substantia, but in Greek ousia," "that in divine Scripture nothing is written about them and that they are above men’s knowledge and above men’s understanding" ([Fourth Century Christianity - Second Creed of Sirmium - 358][13]). This is called Homo-ianism (see [Acacians - Wikipedia][14]). RPC Hanson lists twelve creeds from the fourth century that reflect the Homoian faith (Hanson R. P. C. 2005, The Search for the Christian Doctrine of God: The Arian Controversy 318-381 AD. A&C Black. ISBN 978-0-567-03092-4, pp. 558–559)

But another great objection, as explained above, was that the description of the Son as of the same hypostasis and of the same ousia as the Father teaches modalism. It was explicitly to counter the suspicion that the creed teaches modalism that supporters of the Nicene Creed proposed a new meaning for hypostasis:

Basil of Caesarea (AD 375)

The first person to propose a difference in the meanings of hypostasis and ousía, and for using hypostasis as a synonym of person, was Basil of Caesarea, namely in his letters 214 (AD 375 - [Letter 214][15]) and 236 (AD 376 - [Letter 236][16]) (See also Ousía and hypostasis from the philosophers to the councils or Turcescu, Lucian (1997). "Prosopon and Hypostasis in Basil of Caesarea's "Against Eunomius" and the Epistles". Vigiliae Christianae. 51 (4), JSTOR 1583868, p. 374-395.) In both letters, his main motive was to neutralize the objection of the opponents of the Nicene Creed that, to speak of the Father and the Son as one hypostasis, is Sabellianism (modalism).

Gregory of Nyssa (AD 380)

After Basil of Caesarea, in c. 380, Gregory of Nyssa devotes his letter 35 to the difference between ousía and hypostasis (Letter-35).

Emperor Theodosius (AD 380)

As stated, during the five decades after Nicaea, the church opposed the Nicene Creed and formulated various alternative creeds, each proposing alternatives for the word homo-ousios in the Nicene Creed (See [Arian creeds - Wikipedia][10]). In 380, Emperor Theodosius made an abrupt end to this period.

Before Theodosius became emperor, as indicated by the contents of the creeds of that period (See, Arian creeds - Wikipedia), the Nicene supporters were in the minority. When he became emperor, "Arianism was widespread in the eastern half of the Empire" (Williams, Stephen; Friell, Gerard (1994). Theodosius: The Empire at Bay. B.T. Batsford Ltd. ISBN 0-300-06173-0, pp. 46–53).

In February 380, the 23-year-old emperor, through the [Edict of Thessalonica][17], declared:

"Let us believe in the one deity of the Father, the Son, and the Holy Spirit, in equal majesty and in a holy Trinity."

"This edict was the first known secular Roman law to positively define a religious orthodoxy" (Errington, R. Malcolm (2006). Roman Imperial Policy from Julian to Theodosius. Chapel Hill: University of North Carolina Press. ISBN 0-8078-3038-0, p. 217.)

Enforcement

The Edict of Thessalonica authorized imperial punishment for those who oppose it.

On 26 November 380, two days after he had arrived in Constantinople, Theodosius expelled the Homo-ian bishop (See [Theodosius I - Wikipedia][18]). (The Homo-ians are the people who refused to get involved in the debate about the substance of God because His substance is not revealed in the Bible. See [Acacians - Wikipedia][14].)

Through persecution, Theodosius destroyed all resistance to his theology:

"In January of the following year (381), another edict forbade the heretics to settle in the cities." ([Boyd, The Ecclesiastical Edicts of the Theodosian Code, page 45][19]) (cf. Richard Rubenstein, When Jesus Became God, 1999, p. 223).

"In the same year, after the reformulation of the Nicene doctrine by the Council of Constantinople ... the procouncil of Asia was ordered to deliver all churches to these bishops 'who profess that the Father, Son and Holy Spirit are one majesty and virtue'" ([Boyd, pages 45-46][19] or Rubenstein).

In 383, the Emperor ordered the various non-Nicene sects (Arians, Anomoeans, Macedonians, and Novatians) to submit written creeds to him, which he prayerfully reviewed and then burned, save for that of the Novatians, who also supported Nicene Christianity. The other sects lost the right to meet, ordain priests, or spread their beliefs ([Boyd, page 47][19]).

“The execution of Priscillian and his followers may be cited as typical of the treatment of heretics conditions in that time.” In 384, Priscillian was condemned by the synod of Bordeaux, found guilty of magic in a secular court, and put to death by the sword with a number of his followers ([Boyd, pages 60-61][19] or The Edict of [Thessalonica | History Today][20])

382 Synod Letter

After Theodosius destroyed all resistance, the interpretation of hypostasis as meaning “person,” became official church doctrine:

In 382, the bishops in Constantinople, to argue that their belief is not Sabellianism, sent a letter to the western bishops in which they used the phrase, “three most perfect Hypostases, or three perfect Persons” (Papal Encyclicals).

[8]: https://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0057:entry=ou)si/a [9]: https://revelationbyjesuschrist.com/erickson/ [10]: https://en.wikipedia.org/wiki/Arian_creeds [11]: https://revelationbyjesuschrist.com/arian/ [12]: https://en.wikipedia.org/wiki/Arianism [13]: https://www.fourthcentury.com/second-creed-of-sirmium-or-the-blasphemy-of-sirmium/ [14]: https://en.wikipedia.org/wiki/Acacians [15]: https://www.elpenor.org/basil/letters-3.asp [16]: https://www.elpenor.org/basil/letters-3.asp?pg=39 [17]: https://en.wikipedia.org/wiki/Edict_of_Thessalonica [18]: https://en.wikipedia.org/wiki/Theodosius_I [19]: https://revelationbyjesuschrist.com/boyd/ [20]: https://www.historytoday.com/archive/months-past/edict-thessalonica

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The Wikipedia article on Hypostasis makes it clear that there was some confusion in terminology due to language difficulties of Latin, Greek and English.

The concepts being referred to are confused by misunderstanding what 'substance' and 'essence' actually mean when applied to Divine Persons.

It was mainly under the influence of the Cappadocian Fathers that the terminology was clarified and standardized so that the formula "three hypostases in one ousia" came to be accepted as an epitome of the orthodox doctrine of the Trinity.[5] Specifically, Basil of Caesarea argues that the two terms are not synonymous and that they, therefore, are not to be used indiscriminately in referring to the godhead. He writes:

The distinction between ousia and hypostases is the same as that between the general and the particular; as, for instance, between the animal and the particular man. Wherefore, in the case of the Godhead, we confess one essence or substance so as not to give variant definition of existence, but we confess a particular hypostasis, in order that our conception of Father, Son, and Holy Spirit may be without confusion and clear.[5]

This consensus, however, was not achieved without some confusion at first in the minds of Western theologians since in the West the vocabulary was different. Many Latin-speaking theologians understood hypo-stasis as "sub-stantia" (substance); thus when speaking of three "hypostases" in the godhead, they might suspect three "substances" or tritheism. However, from the middle of the fifth century onwards, marked by Council of Chalcedon, the word came to be contrasted with ousia and used to mean "individual reality," especially in the trinitarian and Christological contexts. The Christian concept of the Trinity is often described as being one god existing in three distinct hypostases/personae/persons.[6]

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