The essence of human nature is to seek profit and avoid harm. Worshiping the strong is to approach and utilize them, while sympathizing with the weak is to demonstrate one's character. For those unrelated to interests, their true nature often shows again and again. Life is not for money, but life needs money. First, kneel and earn the money, then you have the qualification to stand and make choices. If someone suddenly becomes very polite to you, it may not be because they have improved, but because you have become more valuable to them. When others suddenly start to distance themselves from you, it is not because you did something wrong, but because they can't get any benefit from you. A person's fate depends on their understanding of human nature. Maturity is not about understanding things, but about understanding human nature. Humans are a bundle of desires. Unsatisfied, it leads to pain; satisfied, it leads to boredom. Appetite is hard to overcome, sexual desire is extremely difficult to conquer, and vanity is like a black hole that cannot be overcome. Low-level desires can be indulged in to be satisfied; high-level desires can only be achieved through restraint.