《贞观政要·卷十·论慎终》
一个人的行为处世有自己的原则，受人诋毁的人，未必真的行为不端，多年形成的品行，不可能在一朝一夕完全改变。
夫行有素履，事有成迹，所毁之人，未必可信于所举，积年之行，不应顿失于一朝。
A person's behavior has his own principles. People who are slandered may not necessarily behave badly. The character formed over many years cannot be completely changed overnight.