Be not overcome of evil, but overcome evil with good.
Read Chapter 12
It will do us much good if we refrain from evil. The person who appears to be overcome by evil for a time in fact may be overcoming evil, just as the Savior overcame evil by not resisting it. Evil works against itself, and when it is overcome it thinks that it has won! Our enemy acts in such a way as to divert us from our purpose, looking for an opportunity to make us sin. Therefore if we are provoked by him and do not reply in kind, we overcome him with good. Therefore we do not resist, in order to serve the good by ignoring the demands of justice for retribution. Commentary on Paul’s Epistles.
The evil man who is overcome by good is set free, not from an exterior, foreign evil but from an interior, personal one, by which he is more grievously and ruinously laid waste than he would be by the inhumanity of any enemy from without.
This is the apostle's conclusion of the foregoing instructions. Be not overcome by the malice of thy enemy, so as to wish to revenge thyself, without leaving all to the just judgment of God; but overcome his malice by thy kindness. This is complied with, when upon occasion of injuries received we always make a return of kindness, and in proportion as the malice of our enemies increases, our spirit of benevolence should also increase. (Estius) _
After giving the wronged person what he wants, Paul goes on to give him advice of a higher tone, telling him not to be overcome with evil. For he knew that even if the enemy was a brute he would not go on being an enemy once he was fed…. To overcome evil with good is true victory.