Nicene and Post-Nicene Fathers, Vol. II:
City of God: Chapter 38

Chapter 38.—That the Ecclesiastical Canon Has Not Admitted Certain Writings on Account of Their Too Great Antiquity, Lest Through Them False Things Should Be Inserted Instead of True.

If I may recall far more ancient times, our patriarch Noah was certainly even before that great deluge, and I might not undeservedly call him a prophet, forasmuch as the ark he made, in which he escaped with his family, was itself a prophecy of our times. 1213   What of Enoch, the seventh from Adam?  Does not the canonical epistle of the Apostle Jude declare that he prophesied? 1214   But the writings of these men could not be held as authoritative either among the Jews or us, on account of their too great antiquity, which made it seem needful to regard them with suspicion, lest false things should be set forth instead of true.  For some writings which are said be theirs are quoted by those who, according to their own humor, loosely believe what they please.  But the purity of the canon has not admitted these writings, not because the authority of these men who pleased God is rejected, but because they are not believed to be theirs.  Nor ought it to appear strange if writings for which so great antiquity is claimed are held in suspicion, seeing that in the very history of the kings of Judah and Israel containing their acts, which we believe to belong to the canonical Scripture, very many things are mentioned which are not explained there, but are said to be found in other books which the prophets wrote, the very names of these prophets being sometimes given, and yet they are not found in the canon which the people of God received.  Now I confess the reason of this is hidden from me; only I think that even those men, to whom certainly the Holy Spirit revealed those things which ought to be held as of religious authority, might write some things as men by historical diligence, and others as prophets by divine inspiration; and these things were so distinct, that it was judged that the former should be ascribed to themselves, but the latter to God speaking through them:  and so the one pertained to the abundance of knowledge, the other to the authority of religion.  In that authority the canon is guarded.  So that, if any writings outside of it are now brought forward under the name of the ancient prophets, they cannot serve even as an aid to knowledge, because it is uncertain whether they are genuine; and on this account they are not trusted, especially those of them in which some things are found that are even contrary to the truth of the canonical books, so that it is quite apparent they do not belong to them.

Footnotes

Heb. 11:7, 1 Pet. 3:20, 21.

Jude 14.