Hurtful actions and reprisals are different but closely related. Actions once done are finished with, there’s no need to answer with revenge and hostility. This is called “action” (kamma). “Reprisal” (vera) means to continue that action further with thoughts of “you did it to me so I’m going to get you back.” There’s no end to this. It brings about the continual seeking of revenge, and so hatred is never abandoned. As long as we behave like this the chain remains unbroken, there’s no end to it. No matter where we go, the feuding continues. ~Ajahn Chah
The way to develop love is through thinking out the evils of hate, and the advantages of non-hate; through thinking out according to actuality, according to karma, that really there is none to hate, that hate is a foolish way of feeling which breeds more and more darkness, that obstructs right understanding. Hate restricts; love release. Hatred strangles; love enfranchises. Hatred brings remorse; love brings peace. Hatred agitates; love quietens, stills, calms. Hatred divides; love unites. Hatred hardens; love softens. Hatred hinders; love helps. And thus through a correct study and appreciation of the effects of hatred and the benefits of love, should one develop love. ~Ven. Piyadassi