Psalms 58:10

There is no advantage for vessels fitted for destruction that God patiently endures them, to destroy them in due order and to use them as a means of salvation for those on whom he has mercy. But there is advantage for those for whose salvation God uses this means. As it is written, "The just shall wash his hands in the blood of the wicked," that is, he shall be cleansed from evil works by the fear of God when he sees the punishment of sinners. That God shows his wrath in bearing with vessels of wrath avails to set a useful example to others but also to "make known the riches of his glory on vessels of mercy that he prepared for glory." The hardening of the ungodly demonstrates two things—that a person should fear and turn to God in piety and that thanks should be given for his mercy to God who shows by the penalty inflicted on some the greatness of his gift to others. If the penalty he exacts from the former is not just, he makes no gift to those from whom he does not exact it. But because it is just, and there is no unrighteousness with God who punishes, who is sufficient to give thanks to him? For he remits a debt which, if God wanted to exact it, no person could deny was justly due.

And do you wish that I should speak of another instance of God's goodness? It is not only this, but that He does not suffer the good to become bad. For if they were destined to meet with the same things, they would all be bad. But now this also does not a little console the good. For hear the Prophet, saying, "The righteous shall rejoice when he seeth the vengeance upon the ungodly, he shall wash his hands in the blood of the sinner." Not rejoicing on account of it, God forbid! but fearing lest he should suffer the same things, he will render his own life more pure. This then is a mark of His great care. Yes, you say, but He ought only to threaten, and not to punish also. But if He does punish, and still you say it is a matter of threat, and on that account become more slothful, if it were really but a threat, would you not become more supine? If the Ninevites had known it was a matter of threat, they would not have repented. But because they repented, they cause the threat to stop at words only. Dost thou wish it to be a threat only? Thou hast the disposal of that matter. Become a better man, and it stops only at the threat. But if, which be far from thee! thou despiseth the threat, thou wilt come to the experience of it. The men before the flood, if they had feared the threat, would not have experienced the execution of it. And we, if we fear the threat, shall not expose ourselves to experience the reality. God forbid we should. And may the merciful God grant that we all henceforth, having been brought to sound mind, may obtain those unspeakable blessings.