John Chrysostom

"And that they may recover themselves out of the snare of the devil, who are taken captive by him at his will." It is truly said, "Who are taken captive," for meanwhile they float in error. Observe here how he teaches to be humble-minded. He has not said, if peradventure you should be able, but, "if peradventure God should grant them a recovery"; if anything be done, therefore, all is of the Lord. Thou plantest, thou waterest but He soweth and maketh it produce fruit. …

Homily on 2 Timothy 6 ↗

Theophylact of Ohrid

Understand this not only in relation to teaching, but also in relation to life. People are in the snare of the devil not only in teaching, but also in life. Consequently, without bitterness one must correct also those who waver in life. For just as a sparrow, even if caught by only one part, I mean the foot, is in the power of the one who set the snare, so we too are in the power of the devil, even if we have been caught by him not entirely, I mean in both faith and life, but only in life. …

Commentary on 2 Timothy ↗

Ignatius of Antioch

For as many as are of Christ are also with the bishop; but as many as fall away from him, and embrace communion with the accursed, these shall be cut off along with them. For they are not Christ's husbandry, but the seed of the enemy, from whom may you ever be delivered by the prayers of the shepherd, that most faithful and gentle shepherd who presides over you. …

Epistle of Ignatius to the Philadelphians ↗

Thomas Aquinas

And they may recover themselves from the snares of the devil, i.e., from the causes of error on the part of the intellect, as false phantasies, and on the part of the will, as envies, pride, and the like. But the need for repentance is pressing, so that if a person rejects it, the devil will rule him; hence he says, by whom they are held captive, because he that sins is the servant of sin (John 8:34). And he says, at his will, namely, such a man does the devil's will. …

Commentary on 2 Timothy ↗