Andreas of Caesarea : As often as we sin, we are born of the devil. But we are of God once again, as often as we pursue virtue. — CATENA Augustine of Hippo : "He that doeth sin, is of the devil, because the devil sinneth from the beginning." "Is of the devil:" ye know what he means: by imitating the devil. For the devil made no man, begat no man, created no man: but whoso imitates the devil, that person, as if begotten of him, becomes a child of the devil; by imitating him, not literally by being begotten of him. In what sense art thou a child of Abraham, not that Abraham begat thee? In the same sense as the Jews, the children of Abraham, not imitating the faith of Abraham, are become children of the devil: of the flesh of Abraham they were begotten, and the faith of Abraham they have not imitated. If then those who were thence begotten were put out of the inheritance, because they did not imitate, thou, who art not begotten of him, art made a child, and in this way shall be a child of him by imitating him. And if thou imitate the devil, in such wise as he became proud and impious against God, thou wilt be a child of the devil: by imitating, not that he created thee or begat thee. "Unto this end was the Son of God manifested." Now then, brethren, mark! All sinners are begotten of the devil, as sinners. Adam was made by God: but when he consented to the devil, he was begotten of the devil; and he begat all men such as he was himself. With lust itself we were born; even before we add our sins, from that condemnation we have our birth. For if we are born without any sin, wherefore this running with infants to baptism that they may be released? Then mark well, brethren, the two birth-stocks, Adam and Christ: two men are; but one of them, a man that is man; the other, a Man that is God. By the man that is man we are sinners; by the Man that is God we are justified. That birth hath cast down unto death; this birth hath raised up unto life: that birth brings with it sin; this birth setteth free from sin. For to this end came Christ as Man, to undo the sins of men. "Unto this end was the Son of God manifested, that He may undo the works of the devil." — Ten Homilies on 1 John 4 Bede : Whoever commits sin is of the devil. Not deriving the origin of the flesh from the devil, as the Manichean impiously believes of all men, but taking the imitation or suggestion of sinning from him, in the same way that we become children of Abraham by imitating the faith of Abraham. And conversely, the Jews, who are children of Abraham, by abandoning the faith of Abraham, have become children of the devil, as the Lord says to them: You are of your father the devil (John 8). — Commentary on the Catholic Epistles Bede : For the devil has been sinning from the beginning. When he mentioned "from the beginning," he added the verb in the present tense, "sins." Because from the beginning when the devil started to sin, he has never ceased, neither restrained by the enormity of present punishments nor the fear of future ones. Therefore, it is said to be justified for anyone who neglects to turn away from sin. But the devil sins from the beginning, from that moment when he himself was made, when also the origin of all creatures began. For it is not to be doubted that angels were created among the first creatures, but while the others returned the glory of their condition to the praise of the Creator, he who was first created, as soon as he beheld the height of his own brightness, swelled with pride against the Creator with his followers, and through that same pride, sinning from the beginning, was transformed from an archangel into the devil. — Commentary on the Catholic Epistles Bede : The Son of God appeared to destroy the works of the devil. All sinners are born of the devil in as much as they are sinners. Adam was made by God; but when he agreed with the devil, he was born of the devil, and begot all such as he was. That birth cast down to death; the second birth, which is baptism, raised up to life. That birth brings sin with it; the second birth frees from sin. Therefore Christ became man, to free mankind from sin; of which release it is rightly added: — Commentary on the Catholic Epistles Clement of Alexandria ((as quoted by Cassiodorus)) : "He that does unrighteousness is of the devil," that is, of the devil as his father, following and choosing the same things. "The devil sins from the beginning," he says. From the beginning from which he began to sin, incorrigibly persevering in sinning. — From the Latin Translation of Cassiodorus Didymus the Blind : Since the devil was first and foremost sent into the world in order to lead people astray, that is where his name comes from. Thus anyone who sins can be called a devil. Sin is not inherent in the human race, since if it were it could not have been eradicated by a sinless human being. But this is exactly what happened when the Son of God appeared in human flesh, and so sin must be regarded as accidental to human nature, not as intrinsic to human nature. — COMMENTARY ON 1 JOHN John Chrysostom : Because the devil was the first to be locked into sin, everyone who now sins acts according to his bidding. For the devil rules in the sinner by a mass of evil thoughts, as in the case of Judas. Someone might say that the devil is present in sinners even before they sin because they have made room for him. The answer to this is that committing sin and making room for the devil amount to one and the same thing—sin. — CATENA Oecumenius : Whoever commits sin is of the Devil, for the Devil has sinned from the beginning. For this purpose, the Son of God was revealed, that He might destroy the works of the Devil. And just as this is true, so also equally: he who easily sins is from the sinner; however, this one is the Devil, as he who sinned from the beginning. Therefore, God, providing for His creation, became righteousness and sanctification, was revealed or appeared in the world, to take away the works of the Devil, which are sin. "Whoever commits sin is of the Devil." Since the Devil was changed by sinning, anyone who acts sinfully operates under his influence: for the Devil first enters the sinner through the prompting of wicked thoughts, just as in Judas. But someone may say: How does the Devil enter those who sin (Luke 22:3; Jn. 13:27), since they have already sinned by giving him a place? (Eph. 4:27) To which it must be said that commits sin is the same as to sin by giving place to the Devil. For he gives place to him who is subject to lust, after he has effectively received him, perfecting sin: for this signifies to do it. And he rightly said here: "Whoever practices," not "Whoever practiced"; since he who repents is no longer of the Devil: but only he who still commits sin. For thus also he is a servant of sin who commits sin, and not who did. Therefore John says: "Everyone who does sin is a servant of sin." (Jn. 8:34) — Commentary on 1 John Origen of Alexandria : Insofar as we commit sins, we have not yet put off the generation of the devil, even if we are thought to believe in Jesus. Everyone who is not of the devil does not commit sin. — COMMENTARY ON John 20.103-4