Augustine of Hippo
Catena Aurea · Johannesevangelium 8
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it. And because I tell you the truth, ye believe me not. Which of you convinceth me of sin? And if I say the truth, why do ye not believe me? He that is of God heareth God’s words: ye therefore hear them not, because ye are not of God.
(Tr. xlii. 10) Here we must guard against the heresy of the Manichæans, who hold a certain original nature of evil, and a nation of darkness with princes at their head, whence the devil derives his existence. And thence they say our flesh is produced; and in this way interpret our Lord’s speech, Ye are of your father the devil: viz. to mean that they were by nature evil, drawing their origin from the opposite seed of darkness.