Tractates on the Gospel of John

¹⁸ For this follows: “and the life was the light of men;” and from this very life are men illuminated. Cattle are not illuminated, because cattle have not rational minds capable of seeing wisdom. But man was made in the image of God, and has a rational mind, by which he can perceive wisdom. That life, then, by which all things were made, is itself the light; yet not the light of every animal, but of men. Wherefore a little after he says, “That was the true light, which lights every man that comes into the world.” By that light John the Baptist was illuminated; by the same light also was John the Evangelist himself illuminated. He was filled with that light who said, “I am not the Christ; but He comes after me, whose shoe's latchet I am not worthy to unloose.” By that light he had been illuminated who said, “In the beginning was the Word, and the Word was with God, and the Word was God.” Therefore that life is the light of men.