Einstein once vividly described the relationship between knowledge and ignorance. He said, let us draw a circle. What a person knows is like what a person does not know inside the circle. It's like the outside of the circle. The more things a person knows, the larger the circle will be, and the wider the outside of the circle will be. In other words, the more one knows, the more ignorance one knows. \x0d\Socrates famous saying: Wisdom means knowing one's ignorance. \x0d\We all think that we are knowledgeable people, able to absorb a lot of knowledge, and thus continue to expand. However, our circle is also constantly growing, and the field of ignorance is also constantly expanding, and no one can occupy it. Everything, and no one can have nothing. No one can do everything, and no one can be good at anything. \x0d\The greater the power a cadre has, the greater his responsibility. \x0d\The greater the profit of a stock, the greater its risk. \x0d\The more wisdom a wise man has, the more ignorance he has. \x0d\The more people and strength a family has, the greater its consumption will be. \x0d\In a kind of life, the more he invests, the greater his return will be. \x0d\In other words, \x0d\The greater the risk of a stock, the greater its profit. \x0d\The more ignorance a wise man has, the more wisdom he has. \x0d\The greater a family's consumption, the greater its power. \x0d\The greater a cadre's responsibility, the greater his rights. \x0d\In a life, the more he returns, it means that he has invested a lot. \x0d\The more a person knows, the more ignorant he becomes.