Great wisdom is foolish, including great wisdom, and people who are stupid outside hide their talents deeply, giving people a look of chaos and ignorance. In fact, they use mental labor; "If you are stupid" is just a representation and strategy, not really stupid; Foolish outside and wise inside, great wisdom also.
"Even the wisest man is foolish" is not deliberately playing dumb, deliberately putting on airs, nor pretending to be deep and mysterious, but a way of dealing with people, an attitude that is calm, not afraid of chaos, not flattering, neither humble nor impetuous, hidden, spontaneous, plain, ordinary, calm, transparent and incomplete.
Extended data
Even the wisest man is foolish, which is an idiom in China. The pinyin is dàzhìruo Yu. It means that a really smart person looks like a fool on the surface. Describe a person's great wisdom beyond ordinary people, not understood, and his speech and behavior are regarded as stupid.
Synonyms are clumsy, enlightened, unobtrusive and hidden.
The antonym is sharp-edged and arrogant and stupid.
Baidu Encyclopedia-No matter how clever a person is, he is also stupid (China idiom)