I. Natural Science and Its Boundaries

What I have been saying about the boundaries of man's knowledge of Nature should have given some indication at least of the difference between the cognition of higher worlds, as we call it in Spiritual Science, and the cognition of which we speak in our ordinary, everyday consciousness or in ordinary science. In everyday life and in ordinary science we let our powers of cognition remain at a standstill with whatever we have acquired through the ordinary education that has brought us to a certain stage in life, and with whatever this education has enabled us to make out of inherited qualities and out of qualities possessed by mankind in general. What is called in anthroposophical Spiritual Science the knowledge of higher worlds depends upon a man himself deliberately undertaking further training and development; upon the realisation that as life continues on its course a higher form of consciousness can be attained through self-education, just as a child can advance to the stage of ordinary consciousness. And it is to this higher consciousness that there are first revealed the things we otherwise look for in vain at the two boundaries of the knowledge of Nature, at the boundary of matter and at the boundary of ordinary consciousness.