Philosopher Quotes and aphorisms about physical Friedrich Nietzsche Deepak Chopra Deepak Chopra Maimonides Rudolf Steiner ,, Descriptions of inner, spiritual processes are much more liable to misunderstanding than descriptio... Rudolf Steiner Rudolf Steiner ,, If spiritual science is to do the same for spirit that natural science has done for nature, it must... Ian Hacking Hans Jonas ,, The simple truth of our finiteness is that we could, by whatever means, go on interminably only at ... Karl Popper