The observance of human nature entails a knowledge of what it is and the knowledge of what the environment. It requires the knowledge of the man a certain face; the true The experience of the existence requires, as a precondition, a definition, a understanding and a perception that bring to this existence, the deepest aspiration of the Man: happiness, the well-being. Our activity; research derives its reason for this reality. The research is a quest of the truth on the human person, its existence and the conditions of the latter. By truth, we hear all this is contrary to the deformations successive, has known the human person as to its perception by its similar and by itself.