Wisdom is the wisdom of self. Ming is the Ming of the mind. "Knowing people" knows the outside world; "Self-knowledge" is clear in Tao. A wise man knows people but not friends, and knows the outside but not the inside; Smart people know themselves, both inside and outside. Wisdom is conscious, formed in the day after tomorrow, comes from the outside world, is the knowledge and understanding of superficial phenomena, and is limited and subjective; Ming is an understanding of the nature of the world, which is infinite, objective and comprehensive. If you want insight, you must return to the Tao. Only those who know themselves are truly enlightened.
"Those who know others are wise, and those who know themselves are clear." It means that people who know others correctly are smart, and people who know themselves correctly are smart. A really smart person should know others correctly and know himself correctly.