First of all, human nature: from the perspective of the difference between humans and animals, human nature lies in social labor. From the perspective of the distinction between people, the essence of people lies in social relations. Man is the undertaker of social relations, and social relations determine his social status. Social relations are various, among which economic relations play a leading role, and human nature is the sum of all social relations. Social relations are constantly changing and developing, so human nature is concrete and historical. For example, a woman thinks her boyfriend is a good man, but marrying him will be integrated with his social relations. If parents strongly disapprove of their marriage, should they give up or get a naked marriage license? If they don't give up, will they get financial support from their parents?