15. How Are the Eternal Forces of the Human Soul Investigated?

Now I have often explained here that the path that spiritual research has to take is an entirely inward one; that although this spiritual science wants to be as scientific, as strictly scientific as any natural science, the path it has to take because it does not deal with the sensory world but with the spiritual, that this path must be a purely inward one. I shall not go into the exact nature of this inner path today; I have done so here often enough, and the same thing cannot be repeated over and over again. I must refer you to what is written in my book “How to Know Higher Worlds”, where it is described in detail what the soul has to do with itself if it wants to go the way that awakens certain dormant powers in it, which can be called spiritual eyes and spiritual ears, to use these Goethean expressions. It describes the development the soul must undergo to acquire such spiritual eyes and ears, in order to be able to see into a spiritual world just as the senses can see into the world of the senses.