But they say that In the beginning does not absolutely express eternity: for that the same is said of the heaven and the earth: In the beginning God made the heaven and the earth. (Gen. 1:1) But are not made and was, altogether different? For in like manner as the word is, when spoken of man, signifies the present only, but when applied to God, that which always and eternally is; so too was, predicated of our nature, signifies the past, but predicated of God, eternity.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. in Joan. iii. [ii.] §. 2.