The famous saying "A gentleman must have a physical examination when he speaks" comes from Kang Cangzi, an ancient Taoist masterpiece in China. The general idea of this passage is that everyone has shortcomings and depends on his own understanding. Sages will not talk about people's shortcomings because of tolerance, villains will flatter because of their violent love, and relatives will not talk about them face to face because of pity, so people's shortcomings can only rely on self-knowledge. A gentleman should always reflect on himself, just as he knows that he often has shortcomings and mistakes. It is regarded as the motto by some great men and gentlemen.

Celebrities of all ages have quoted Kang Cangzi's articles. For example, Li Shimin quoted in his fourth book "Emperor Fan-Examiner": Today's wisdom is short and long, but it can be big or small. ["Kang Cangzi" said: Politics is the most important thing, and it is the judge. Only a scholar can do it, compared with a township, the hometown of the Committee; It is better than a county, a county committee; It is better than the state of a country and a Committee; Only then can it be compared with a country and entrusted to its national government. Then you can have no master. Speak your mind and think about dating. ]