have culminated in the rapidly expanding culture of the twentieth century. And only by adherence to these essentials can man hope to maintain his present-day civilizations while providing for their continued development and certain survival.

This is the gist of the long, long struggle of the peoples of earth to establish civilization since the age of Adam. Present-day culture is the net result of this strenuous evolution. Before the discovery of printing, progress was relatively slow since one generation could not so rapidly benefit from the achievements of its predecessors. But now human society is plunging forward under the force of the accumulated momentum of all the ages through which civilization has struggled.