The main feature of the modern world is that of change, rapid and profound change that the creative energies of man had brought about in all fields: intellectual formation is ever increasingly based on the mathematical and natural sciences while in the practical order, technology takes on mounting importance. Biology, psychology and the social sciences also give men hope of improved self-knowledge. History itself speeds along on so rapid a course that an individual person can scarcely keep abreast of it. Thus the human race has passed from a rather static concept of reality to a more dynamic, evolutionary one.