The goal of pacifism is possible only though a supranational organization. To stand unconditionally for this cause is the criterion of true pacifism.

The years of searching in the dark for a truth that one feels but cannot express, the intense desire and the alternations of confidence and misgiving until one breaks through to clarity and understanding, are known only to him who has experienced them himself.

A finely tempered nature longs to escape from the personal life into the world of objective perception and thought.

Play is the highest from of research.

Science is the century-old endeavor to bring together by means of systematic thought the perceptible phenomena of this world into as thorough-going an association as possible.

The whole of science is nothing more than a refinement of everyday thinking.

My sense of god is my sense of wonder about the universe.