If he experiences countless disasters in his life, the pain brought by the disasters can make him improve his understanding of the world and awaken his understanding. After each pain, it gives people a strong thinking and willpower, which can pry the great power in the moving subconscious and produce a new understanding of the world. The deeper the pain, the deeper people's awareness and the higher the understanding of human and social thought. Therefore, pain is a buried gold mine and a precious wealth that cannot be traded in the market. Human cognition is not obtained from books, but from experience. Painful experience can extend the depth and breadth of understanding.