No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

In a sense, knowledge shrinks as wisdom grows, for details are swallowed up in principles. The details for knowledge which are important, will be picked up ad hoc in each avocation of life, but the habit of the active utilization of well-understood principles is the final possession of WISDOM.

Knowledge shrinks as wisdom grows.

In the history of the world the prize has not gone to those species which specialized in methods of violence, or even in defensive armor. In fact, nature began with producing animals encased in hard shells for defense against the ill of life. But smaller animals, without external armor, warm-blooded, sensitive, alert, have cleared those monsters off the face of the earth.

The aim of science is to seek the simplest explanation of complex facts... Seek simplicity and distrust it.

The deepest definition of youth is life as yet untouched by tragedy.

Algebra reverses the relative importance of the factors in ordinary language.