Matthew 3:7

How then doth Christ say, that they did not believe John? Because this was not believing, to decline receiving Him whom he preached. For so they thought they regarded their prophets and their lawgiver, nevertheless He said they had not regarded them, forasmuch as they received not Him, that was foretold by them. "For if ye had believed Moses," saith He, "ye would have believed Me." And after this again, being asked by Christ, "The baptism of John, whence is it?" they said, "If we shall say, Of earth, we fear the people; if we shall say, From heaven, He will say unto us, How then did ye not believe him?" So that from all these things it is manifest that they came indeed and were baptized, yet they did not abide in the belief of that which was preached. For John also points out their wickedness, by their sending unto the Baptist, and saying, "Art thou Elias? Art thou Christ?" wherefore he also added, "they which were sent were of the Pharisees."

And to convince thee that the Pharisees came with one mind, and the people with another, hear how the evangelist hath declared this too; saying of the people, "that they came and were baptized of him, confessing their sins;" but concerning the Pharisees, no longer like that, but that "when he saw many of the Pharisees and Sadducees coming, he said, O generation of vipers, who hath warned you to flee from the wrath to come?" O greatness of mind! How doth he discourse unto men ever thirsting after the blood of the prophets, and in disposition no better than serpents! how doth he disparage both themselves and their progenitors with all plainness! "Yea," saith one; "he speaks plainly enough, but the question is if there be any reason in this plainness. For he did not see them sinning, but in the act of change; wherefore they did not deserve blame, but rather praise and approbation, for having left city and houses, and making haste to hear his preaching." What then shall we say? That he had not things present, and even now doing, in his view, but he knew the secrets of their mind, God having revealed this. Since then they were priding themselves on their forefathers, and this was like to prove the cause of their destruction, and was casting them into a state of carelessness, he cuts away the roots of their pride. For this cause Isaiah also calls them, "rulers of Sodom," and "people of Gomorrah;" and another prophet saith, "Are ye not as children of the Ethiopians;" and all withdraw them from this way of thinking, bringing down their pride, which had caused them unnumbered evils.

But if one accurately mark his words, he hath also tempered his rebuke with commendation. For he spake these things, as marveling at them, that they were become able, however late, to do what seemed almost an impossibility for them. His rebuke, you see, is rather that of one bringing them over, and working upon them to arouse themselves. For in that he appears amazed, he implies both their former wickedness to be great, and their conversion marvellous and beyond expectation. Thus, "what hath come to pass," saith he, "that being children of those men, and brought up so badly, they have repented? Whence hath come so great a change? Who hath softened down the harshness of their spirit? Who corrected that which was incurable?" And see how straightway from the beginning he alarmed them, by laying first, for a foundation, his words concerning hell. For he spake not of the usual topics: "Who hath warned you to flee from wars, from the inroads of the barbarians, from captivities, from famines, from pestilences?" but concerning another sort of punishment, never before made manifest to them, he was striking the first preparatory note, saying thus, "Who hath warned you to flee from the wrath to come?"

And full well did he likewise call them, "generation of vipers." For that animal too is said to destroy the mother that is in travail with her, and eating through her belly, thus to come forth unto light; which kind of thing these men also did being "murderers of fathers, and murderers of mothers," and destroying their instructors with their own hands.

(De Civ. Dei, ix. 5.) God is described in Scripture, from some likeness of effects, not from being subject to such weakness, as being angry, and yet is He never moved by any passion. The word 'wrath' is applied to the effects of his vengeance, not that God suffers any disturbing affection.