Take heed now to yourselves, and not to be like some, adding largely to your sins, and saying, "The covenant is both theirs and ours." But they thus finally lost it, after Moses had already received it. Barnabas (A.D. 70-130) ch.4
We take earnest heed in these last days; for the whole [past] time of your faith will profit you nothing, unless now in this wicked time we also withstand coming sources of danger, as becomes the sons of God that the Black One may find no means of entrance. Barnabas (A.D. 70-130) ch.4
Take heed, lest resting at our ease, as those who are the called [of God], we should fall asleep in our sins, and the wicked prince, acquiring power over us, should thrust us away from the kingdom of the Lord. And all the more attend to this, my brethren, when you reflect and behold, that after so great signs and wonders were wrought in Israel, they were thus [at length] abandoned. Let us beware lest we be found [fulfilling that saying], as it is written, "Many are called, but few are chosen." Barnabas (A.D. 70-130) ch.4
Watch for your life's sake. Let not your lamps be quenched, nor your loins unloosed; but be ready, for you know not the hour in which our Lord will come. But come together often, seeking the things which are befitting to your souls: for the whole time of your faith will not profit you, if you are not made perfect in the last time. Didache (A.D. 80-140) ch. 16
Look you, brethren, lest His benefits, which are many, turn unto judgment to all of us, if we walk not worthily of Him, and do those things which are good and well-pleasing in His sight with concord. … It is right therefore that we should not be deserters from His will. Clement of Rome (A.D. 96) ch.21
But they that endured patiently in confidence inherited glory and honor; they were exalted, and had their names recorded by God in their memorial for ever and ever. Amen. To such examples as these therefore, brethren, we also ought to cleave. For it is written; Cleave unto the saints, for they that cleave unto them shall be sanctified. Clement of Rome (A.D. 96) ch. 46
And we ought not rather to fear men but God. For this cause, if you do these things, the Lord said, Though you be gathered together with Me in My bosom, and do not My commandments, I will cast you away and will say unto you, Depart from Me, I know you not whence you are, you workers of iniquity. Second Clement (A.D. 100) ch.4
The promise of Christ is great and marvelous, even the rest of the kingdom that shall be and of life eternal. What then can we do to obtain them, but walk in holiness and righteousness, and consider these worldly things as alien to us, and not desire them? For when we desire to obtain these things we fall away from the righteous path. Second Clement (A.D. 100) ch.5
And the scripture also said in Ezekiel, Though Noah and Job and Daniel should rise up, they shall not deliver their children in the captivity. But if even such righteous men as these cannot by their righteous deeds deliver their children, with what confidence shall we, if we keep not our baptism pure and undefiled, enter into the kingdom of God? Or who shall be our advocate, unless we be found having holy and righteous works? Second Clement (A.D. 100) ch. 6
We ought to know that he which contends in the corruptible contest, if he be found dealing corruptly with it, is first flogged, and then removed and driven out of the race-course. What think you? What shall be done to him that has dealt corruptly with the contest of incorruption? For as concerning them that have not kept the seal, He said, Their worm shall not die, and their fire shall not be quenched, and they shall be for a spectacle unto all flesh. Second Clement (A.D. 100) ch.7
Wherefore, my brethren, let us not be double-minded but endure patiently in hope, that we may also obtain our reward. Second Clement (A.D. 100) ch. 11
Let us therefore practice righteousness that we may be saved unto the end. Blessed are they that obey these ordinances. Though they may endure affliction for a short time in the world, they will gather the immortal fruit of the resurrection. Second Clement (A.D. 100) ch.19
For since, by the introduction into an appropriation us of the Holy Spirit, we are all "the temple of God," modesty is the sacristan and priestess of that temple, who is to suffer nothing unclean or profane to be introduced (into it), for fear that the God who inhabits it should be offended, and quite forsake the polluted abode. Tertullian (A.D. 198) Ante-Nicene Fathers vol.4 pg. 18
Fear is the foundation of salvation; presumption is an impediment to fear. More useful, then, is it to apprehend that we may possibly fail, than to presume that we cannot; for apprehending will lead us to fear, fearing to caution, and caution to salvation. On the other hand, if we presume, there will be neither fear nor caution to save us. Tertullian (A.D. 198) Ante-Nicene Fathers vol.4 pg. 19