Augustine of Hippo, Confessions XI.7: By His Co-Eternal Word He Speaks, and All Things are Done

9. Thou callest us, therefore, to understand the Word, God with Thee, God, which is spoken eternally, and by it are all things spoken eternally. For what was spoken was not finished, and another spoken until all were spoken; but all things at once and for ever. For otherwise have we time and change, and not a true eternity, nor a true immortality. This I know, O my God, and give thanks. I know, I confess to Thee, O Lord, and whosoever is not unthankful to certain truth, knows and blesses Thee with me. We know, O Lord, we know; since in proportion as anything is not what it was, and is what it was not, in that proportion does it die and arise. Not anything, therefore, of Thy Word giveth place and cometh into place again, because it is truly immortal and eternal. And, therefore, unto the Word co-eternal with Thee, Thou dost at once and for ever say all that Thou dost say; and whatever Thou sayest shall be made, is made; nor dost Thou make otherwise than by speaking; yet all things are not made both together and everlasting which Thou makest by speaking.