161. But the Son, too, is Light, because “the Life was the Light of men.” S. John i. 8. And the Evangelist, that he might show that he was speaking of the Son of God, says of John the Baptist: “He was not light, but [was sent] to be a witness of the Light. That was the true Light, which lighteth every man that cometh into this world.” S. John i. 9. So, then, since God is Light, and the Son of God the true Light, without doubt the Son of God is true God.