But it is not gained in this way. This knowledge is attained in accordance with one's ideal about it. It is greater than religion, more sacred than anything in the world. The knowledge of self is like union with God. Self-realization is spiritual attainment. Can this be gained by a shallow conception of it? It is the deepest "thing one can reach, the most valuable thing to attain to. It is for this reason that in the East a person does not look for it in a book, nor does a real teacher write a book on these things. He will write about philosophy; he prepares minds to appreciate his teaching; but he does not tell how to do it.