Therefore the first lesson the mystic has to learn is to know the relation between himself and the thing he sees. As soon as a mystic sees life from this point of view, that he connects himself with the thing he sees, he can understand it much better than the average person. Sufism is not a religion, because it does not give any doctrine or principle, but it is a point of view. The ancient Vedantists adopted this point of view in teaching the sacred words Tat Twam Asi: "As Thou art, so I am." With this point of view, when the sight becomes keen, even objects become clear to the seer and speak to him, and what is called psychometry, or such phenomena, become as a play to the seer. The whole life begins to unfold before him like an open book. But there is nothing so interesting for the seer to see or know as human nature, and it is the seer who can see and know another person.