I have heard the claim (and especially here) that English theologians in the Middle Ages made a distinction between the Spirit of Christ as the indwelling Spirit or holy Spirit (holy as an adjective rather than part of the Divine Name/Title) and the Holy Ghost as the third member of the Trinity. I cannot find anything myself that demonstrates that they made this distinction, other than deliberately translating Holy Ghost when referring to the unembodied Third Person of the Trinity, and Spirit (or holy Spirit)(please don't edit this - they lowercase is part of the Translation as an adjective) when referring to the indwelling Spirit of God/Christ in the believer. And this quote from a footnote in the Shepherd of Hermas - Similitude Fifth, Chapter VI.
[If the reader feels that the explanation itself needs to be explained, let him attribute it to the confused and inaccurate state of the text. Grabe says emphatically, that “the created Spirit of Christ as a man and not the Holy Ghost, the third person of the Trinity,” is spoken of in this chapter chiefly. The apparent confusion of words and phrases must be the result of ignorant copying. It is a sufficient answer to certain German critics to cite the providential approval of Athanasius, a fact of the utmost moment. Nobody doubts that Athanasius was sensitive to any discoloration of the Nicene Faith. In the text of Hermas, therefore, as it was in his copy, there could have been nothing heretical, or favouring heresy. That Hermas was an artist, and purposely gave his fiction a very primitive air, is evident. He fears to name the Scriptures he quoted, lest any one should doubt their use, in the days of Clement, in the Western Churches.]
I think the footnote is quoting John Ernest Grabe, but I cannot find his work on the Shepherd of Hermas.
Can anyone direct me to this or some other sources where this distinction seems to be made by earlier English theologians?