Dhammapada

All that we are is the result of what we have thought: it is founded on our thoughts, it is made up of our thoughts. If a man speaks or acts with an evil thought, pain follows him, as the wheel follows the foot of the ox that draws the carriage. All that we are is the result of what we have thought: it is founded on our thoughts, it is made up of our thoughts. If a man speaks or acts with a pure thought, happiness follows him, like a shadow that never leaves him. "He abused me, he beat me, he defeated me, he robbed me,"-in those who harbour such thoughts hatred will never cease. "He abused me, he beat me, he defeated me, he robbed me,"-in those who do not harbour such thoughts hatred will cease. For hatred does not cease by hatred at any time: hatred ceases by love, this is an old rule.