Don't do it with little evil, and don't do it with little good. Only virtue and virtue can serve others. This sentence was said by Liu Chan, the son of Liu Bei during the Three Kingdoms period, when he was dying. It was intended to educate Liu Chan not to despise small things, not to do them because good things have little influence, and not to do them because bad things have little influence. He was encouraged to study in Germany and make a difference. Good things should start with small things, and small things can also achieve great things. Bad things should also start from small things, otherwise many a mickle makes a mickle, which is also a bad thing. Therefore, don't stop doing good things because you are young, let alone doing bad things because you are young.