Our fallen nature is inclined to avenge itself, so much so that this has entered as though into natural right. The outward plausibility of vengeance, whose essence consists in rendering evil for evil, moved the holy Apostle to single out from the general circle of long-suffering those unpleasant things that provoke revenge. He did this in order to set everyone on guard against these especially unrighteous movements of an irritated heart.
It is difficult to restrain impulses of vexation, anger, and revenge. Therefore the Apostle places this virtue under common watchfulness: “See to it.” Of course, he also places it under the special watchfulness of those whose duty is to watch over all the moral and religious states of Christians.
Vengeance places a stain on the whole Christian community before the face of the pagans. Therefore it is justly laid upon all to see that it does not break forth. Let the meek and calm restrain and sober the hot-tempered.
By forbidding Christians vengeance, God takes vengeance upon Himself: “Vengeance is Mine, I will repay, says the Lord” (Rom 12:19). Christians themselves are permitted to avenge only by doing good: “If your enemy is hungry, feed him; if he thirsts, give him drink. For in doing this you will heap coals of fire on his head. Do not be overcome by evil, but overcome evil with good” (Rom 12:20-21).
“But always pursue what is good both to one another and to all.” Apart from the context, this word of the Apostle commands not only that one always be ready to do good to others when the occasion appears, but also that one seek such occasions. One should, as it were, chase after them as after the most profitable prey.
In the context, however, the manner of action opposed to vengeance is indicated. The one who wants revenge searches for ways to do evil for evil. But you, he says, should not be concerned with that. Be concerned with how to do good instead of evil. Be concerned intensely and zealously, so that you will certainly attain this goal and thereby extinguish destructive enmity.
“The highest wisdom consists in not merely refusing to repay evil for evil, but in repaying it with good. Truly, this is a vengeance that brings great benefit both to you and to him, if he is willing” (Chrysostom).
This rule recalls the commandment of the Savior: “Love your enemies, bless those who curse you, do good to those who hate you, and pray for those who abuse you and persecute you. Thus you may be sons of your Father who is in heaven, for He makes His sun rise on the evil and on the good, and sends rain on the righteous and on the unrighteous” (Mt 5:44-45).
Saint Peter also taught not to render evil for evil, or insult for insult, but on the contrary to bless (1 Pet 3:9). The Apostle Paul repeated the same instruction elsewhere: “Bless those who persecute you; bless, and do not curse. Repay no one evil for evil. Provide things good before all men” (Rom 12:14, 17).
The words “to one another and to all” either mean the same as “to the whole body of the Church and, in particular, to each Christian.” Or “to one another” means to Christian brethren, and “to all” means also to unbelievers (Chrysostom, Oecumenius, Theophylact).
This manner of acting toward offenders exalted Christians in the eyes of pagans more than beneficence itself. In beneficence the natural goodwill of the heart was satisfied. Here actions went against the heart. Unregenerate pagans could not understand this according to their principles. They marveled at it as something extraordinary, as indeed it is.