c. 392–422 · Augustine of Hippo, Expositions on the Psalms (Enarrationes in Psalmos) 119.nun.105
Since therefore the only-begotten Word, coequal with the Father, is styled a light; and man when enlightened by the Word is also called a light, who is styled also a lantern, as John, as the Apostles; and since no man of these is the Word, and that Word by whom they were enlightened is not a lantern; what is this word, which is thus called a light and a lantern at the same time, save we understand the word which was sent unto the Prophets, or which was preached through the Apostles; not Christ the Word, but the word of Christ, of which it is written, “Faith cometh by hearing, and hearing by the word of God”? For the Apostle Peter also, comparing the prophetical word to a lantern, saith, “whereunto ye do well that ye take heed, as unto a lantern, that shineth in a dark place.” What, therefore, he here saith, “Thy word” is the word which is contained in all the holy Scriptures.