In the black and white world, nothing is left with color. There is no difference between human nature and animal nature! Selfishness, greed, and desire are all human nature!
If your friend gives you a candy and copies his math homework for you, why? Why? Because he needs you to give him English homework. No matter how pure the friendship between friends is, the exchange of interests is indispensable. This is human nature. Even if parents and children may have some kind of love, what is it about raising children for old age, so many parents who are abandoned by their children, and so many brothers who fall out over the gain and loss of a family property? They are the best proof!
Human nature is full of intrigues and intrigues. Don't deny the truth, goodness and beauty, and don't ignore the evil and treachery. You never know what benefits the person standing opposite you wants to get from you...
Motto: Never bet everything on others!