Don't do it with small evils, don't do it with small goodness. The source is Pei Songzhi's annotation "Biography of the Three Kingdoms and Shu Shu". The general idea is not to think small about bad things or good things. Some people think that this is Liu Bei's last will to his son Liu Chan, urging him to study in Germany and make a difference. Good things should start with small things, and small things can make a big difference. Bad things should also start from small things, otherwise many a mickle makes a mickle, which will also lead to bad things. Therefore, don't stop doing good things because you are young, let alone doing bad things because you are young. Too much small kindness will become great kindness to the world, and too much small evil will be "enough to confuse the country."