Liu Bei left these mottos, one of which has become a family motto in people’s homes today, and another has become a code of conduct for the underworld. Among them, what has become a motto in people's homes today is: "Don't do evil because it's small, don't do good because it's small." This sentence. These words were Liu Bei's instructions to Liu Chan before his death. Liu Bei left these words to Liu Chan to teach Liu Chan that when he was a king, he should remember to do every small good deed and take precautions against every small evil deed. Because no matter how small a small good deed is, after doing it, you are doing a good thing after all. If you do too many small good deeds, then these small good deeds will eventually become a big good thing. And if he starts doing bad things from a small evil at the beginning, then if he does too many bad things, it will inevitably lead to a big disaster over time. Liu Bei's words are very reasonable, so many families now use this sentence to educate their children. Motivate your children to do good things rather than bad things. And the sentence left by Liu Bei: "I don't want to be born in the same year, the same month and the same day, but I want to die in the same year, the same month and the same day", which shows a kind of brotherly loyalty. This kind of brotherly loyalty is also very popular in today's underworld. Therefore, in today's underworld, when brothers become sworn brothers, they will also use this sentence to express the thoughts and feelings of everyone living together and dying together. At that time, Liu Bei, Guan Yu, and Zhang Fei emerged from the grass. Even if Guan Yu is captured by Cao Cao, he is still in Cao Cao's camp and his heart is with Han, and he will not forget Liu Bei's kindness to him; Zhang Fei Changbanpo blocked Cao Cao's army for Liu Bei; after the death of Guan Yu and Zhang Fei, Liu Bei desperately wanted to fight against the enemy, regardless of the consequences. The deep brotherly love of avenging Guan Yu and Zhang Fei was highly praised by later generations of underworld. Therefore, Liu Bei's words have become the guidelines of the underworld.