Motto refers to concise sentences that can be used as people's behavior norms. From the perspective of syntactic structure, aphorisms are relatively complete and independent sentences, which can be used to express ideas independently. Some famous people's words can be used as aphorisms, and some ordinary people summarize their own life experiences as aphorisms, so the source of some aphorisms can't be traced. I'll provide you with a few. 1* Marx has a motto that he believes most: "doubt everything!" 2* believing is light, doubting is dark, believing is the way, and doubting is difficult. Doubt is possible, but miracles are more important. 4* It is better to verify in a short time than to doubt for a long time. 5* Doubts can be solved by understanding. 6* Doubt is the beginning of pain, and sincerity is the beginning of happiness.