As to knowledge, it has two aspects. One knowledge is what one gathers by learning the names and forms of this life. That cannot satisfy this appetite; it is only a stepping-stone to it. This outer learning only helps one to come to the inner learning, but the inner learning is quite different from the outer learning. How is it learned? It is learned by studying the self. One finds that all the knowledge one strives after and all that exists to study, is all in oneself. Therefore one finds a kind of universe in oneself, and by the study of the self one comes to that spiritual knowledge for which the soul hungers.