a man can be given only what he can use; and he can use only that for which he has sacrificed something - Petr Uspensky

Psychology is sometimes called a new science. This is quite wrong. Psychology is, perhaps, the oldest science, and, unfortunately, in its most essential features a forgotten science.

Man is a machine, but a very peculiar machine. He is a machine which, in right circumstances, and with right treatment, can know that he is a machine, and having fully realized this, he may find the ways to cease to be a machine.
First of all, what man must know is that he is not one; he is many. He has not one permanent and unchangeable “I” or Ego. He is always different. One moment he is one, another moment he is another, the third moment he is a third, and so on, almost without end.

Positivism is very good when it seeks an answer to the question of how something operates under given conditions; but when it makes the attempt to get outside of its definite conditions (space, time, causation), or presumes to affirm that nothing exists outside of these given conditions, then it is transcending its own proper sphere.