John Chrysostom

"That no advantage may be gained over us by Satan: for we are not ignorant of his devices."

Seest thou how he both committeth the power to them and again taketh away that by that he may soften them, by this eradicate their self will. But this is not all that he provides for by this, but shows also that should they be disobedient the harm would reach to all, just as he did at the outset also. For then too he said, "A little leaven leaveneth the whole lump." And here again, "Lest Satan should get an advantage of us." And throughout, he maketh this forgiveness the joint act of himself and them.

And tell me not that this one only becomes the wild beast's prey, but consider this also, that the number of the herd is diminished, and now especially when it might recover what it had lost. "For we are not ignorant of his devices," That he destroys even under the show of piety. For not only by leading into fornication can he destroy, but even by the contrary, the unmeasured sorrow following on the repentance for it. When then besides his own he taketh ours too, when both by bidding to sin, he destroys; and when we bid repent, violently seizeth; how is not this case getting "advantage?" For he is not content with striking down by sin, but even by repentance he doth this except we be vigilant.

Wherefore also with reason did he call it getting advantage, when he even conquereth our own weapons. For to take by sin is his proper work; by repentance, however, is no more his; for ours, not his, is that weapon. When then even by this he is able to take, think how disgraceful the defeat, how he will laugh at and run us down as weak and pitiful, if he is to subdue us with our own weapons. For it were matter for exceeding scorn and of the last disgrace, that he should inflict wounds on us through our own remedies. Therefore he said, "for we are not ignorant of his devices," exposing his versatility, his craftiness, his evil devices, his malice, his capacity to injure under a show of piety.