Or we must understand that by, “with men it is impossible, but not with God,” He means, that when we listen to God, it becomes possible, but as long as we keep our human notions, it is impossible. There follows, “For all things are possible with God”; when He says “all things”, you must understand, that have a being, which sin has not, for it is a thing without being and substance [ed. note: This is often urged by St. Augustine against the Manichees, who held that evil was a principle and a substance, coeternal with good. It also appears in the Pelagian controversy, for Pelagius argued that the Catholic doctrine of original sin implied that it was a substance; St. Augustine answers that though not a substance, it was a privation or disorganization of parts, just as darkness is a privation of light, and sickness a disordered state of body; which illustrates what Theophylact means by saying, that sin, though so great an evil, has no being or substance. see Aug. Conf. 7, 12, de Nat. et Grac. 21].
Or else: sin does not come under the notion of strength, but of weakness, therefore sin, like weakness, is impossible with God. But can God cause that not to have been done which has been done? To which we answer, that God is Truth, but to cause that what has been done should not have been done, is falsehood. How then can truth do what is false? He must first therefore quit His own nature, so that they who speak thus really say, Can God cease to be God? which is absurd.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).