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.
The Buddha's Ancient Path Ven. Piyadassi