What is the main content of the novel Natural Selection? What is the world view?

A novel with a questionable world outlook mainly expresses that a person's future is chosen by heaven, and his future fate is decided from birth, whether he is superior or inferior. You can change your destiny, but if you go against the sky, you will be punished by God. Throughout the book, we emphasize who is what life, and God is destined to achieve his life.

For example, someone was born in Pojun, so this person is destined to be a brave man and a general. You can't be a lowly pariah or a civil servant, and your efforts the day after tomorrow can only develop in this direction, otherwise it will be a change of fate, condemned by God, and you will die young and do nothing.