III. The Supersensible Being of Man
Every person, whether he is a scientist of spirit or not, can take in knowledge of this spiritual world and appreciate the degree of truth it contains. This is no different from being able to value the truths and products of chemistry for our ordinary lives without actually being chemists. The scientist of spirit completely understands when those who are immersed in ordinary science and have become familiar with the faculties of the soul that share in it, who have learned to use and develop these faculties for a method of investigation that has resulted in the tremendous successes of modern science (which the science of spirit fully recognizes)—he completely understands when such people must believe for a while that it is not possible to have a science beyond the one bound to the development of the senses and of the brain, that is, which is founded on the kind of thinking that is bound to the physical organism.