Summary

Mathetes Ante-Nicene Fathers Vol. 1 — Introductory Note to the Epistle of Mathetes to Diognetus (1885)

More weight is to be attached to those passages in which the writer speaks of Christianity as still being a new thing in the world. Expressions to this effect occur in several places (chap. i., ii., ix.) , and seem to imply that the author lived very little, if at all, after the apostolic age. There is certainly nothing in the Epistle which is inconsistent with this opinion; and we may therefore believe, that in this beautiful composition we possess a genuine production of some apostolic man who lived not later than the beginning of the second century.
Source: Wikisource

Mathetes Ante-Nicene Fathers Vol. 1 — Introductory Note to the Epistle of Mathetes to Diognetus (1885)

And it can scarcely be denied that the whole tone of the Epistle, as well as special passages which it contains, points to some other writer than Justin. Accordingly, critics are now for the most part agreed that it is not his, and that it must be ascribed to one who lived at a still earlier date in the history of the Church. Several internal arguments have been brought forward in favour of this opinion. Supposing chap. xi. to be genuine, it has been supported by the fact that the writer there styles himself “a disciple of the apostles.”
Source: Wikisource

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