Foucault believes that there are three ways to shape the subject, namely, the right to shape the subject (discipline and punishment), the knowledge to shape the subject (words and things), or the * * * nature of the two (madness and civilization), but he traced back to the source in history and found the third way, that is, self-technology.

In the first part of The History of Sex, Foucault took sex as the research object and found that in ancient Greece, external constraints such as rights and laws were not mature and did not suppress citizens' sex very much, but the Greeks did not indulge in it. Why? It is because they have shaped themselves through their understanding of themselves and the pursuit of an aesthetic style, which is self-technology. Socrates, for example, advocates paying attention to yourself, knowing yourself and discovering your secrets.

Only now we are usually shaped by the first two ways, and our self-skills are suppressed.