Austrian Quotes and aphorisms about nature Sigmund Freud Rudolf Steiner Rudolf Steiner ,, If spiritual science is to do the same for spirit that natural science has done for nature, it must... Rudolf Steiner ,, What is of the nature of spirit and soul must be gleaned from facts belonging to the spirit and sou... Rudolf Steiner Rudolf Steiner Rudolf Steiner Rudolf Steiner Rudolf Steiner Rudolf Steiner