One might as well say he has sold when no one has bought as to say he has taught when no one has learned.

Complete adaptation to environment means death. The essential point in all response is the desire to control environment.

...compartmentalization of occupations and interests bring about a separation of that mode of activity commonly called 'practice' from insight; of imagination from executive 'doing.' Each of these activities is then assigned its own place in which it must abide. Those who write the anatomy of experience then suppose that these divisions inhere in the very constitution of human nature.

The future of our civilisation depends upon the widening spread and deepening hold of the scientific habit of mind.

It is commonplace that a problem stated is well on its way to solution, for statement of the nature of a problem signifies that the underlying quality is being transformed into determinate distinctions of terms and relations or has become an object of articulate thought.

Inference is always an invasion of the unknown, a leap from the known.

The only way to abolish war is to make peace seem heroic.