You are of your father the devil, and the desires of your father you will do. He was a murderer from the beginning, and he stood not in the truth; because truth is not in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father thereof.
Augustine of Hippo
(de Quæst. Nov. et Vet. Test. 2, 90) Or thus: The devil is not a singular, but a common name. In whomsoever the works of the devil are found, he is to be called the devil. It is the name of a work, not of a nature. Here then our Lord means by the father of the Jews, Cain; whom they wished to imitate, by killing the Saviour: for he it was who set the first example of murdering a brother. That he spoke a lie of his own, means that no one sins but by his own will. And inasmuch as Cain imitated the devil, and followed his works, the devil is said to be his father.
Imported from an open dataset — not yet checked against the printed edition.