What is the essence of man or what is man? Each of us already has some kind of understanding of the essence of man, but it never hurts to reflect on it again. The direction of our own growth and development (or degradation), and our approach to raising children, and relationships with other people depend on how we understand the essence of a person ... Some options direct us to the fullest realization of our potential, while others on the contrary, they close many prospects. We are all people, but people are very different: bad and good, smart and stupid, mean and noble, talented and mediocre ... How can the essence of a person be revealed among this diversity? There are a lot of people who are unhappy, dissatisfied with life, lost ... And others are happy, successful, purposeful. Why? Of course, everyone is unique, but can all of our qualities be attributed to unique features? Are they sometimes just a developmental delay or a disease? And how to find out? There must be some kind of frame of reference that gives a certain standard of human essence. Our conclusions will also depend on the system in which we think.