10 Let pure religion, therefore, have this confidence, and doubt not that amid the persecutions at the hand of man and the dangers to the soul, it still has God for its helper, knowing that, if at length it comes to a violent and unjust death, the soul on leaving the tabernacle of the body finds rest with God its upholder; let it have, moreover, perfect assurance of requital in the thought that all evil deeds return upon the heads of those that work them. God cannot be charged with injustice, and perfect goodness is unstained by the impulses and motions of an evil will.
He does not awaken mischief out of malice, but requites it in vengeance; He does not inflict it because He wishes us ill, but He aims it against our sins. For these evils are universally appointed as instruments of retribution without destruction of life, such being the sternly just ordinance of that righteous judgment. But these evils are warded off from the righteous by the law of righteousness, and are turned back upon the unrighteous by the righteousness of that judgment. Each proceeding is equally just; for the righteous, because they are righteous, the warning exhibition of evil without actual infliction; for the wicked, because they so deserve, the punitive infliction of evil; the righteous will not suffer it, though it is displayed to them; the wicked will never cease to suffer it, because it is displayed to them.
Source: Homilies on the Psalms (New Advent)