Without adventure all civilization is full of decay. Adventure rarely reaches its predetermined end. Columbus never reached China.

The 'silly question' is the first intimation of some totally novel development.

The only use of knowledge of the past is to equip us for the present.

Life is complex in its expression, involving more than percipience, namely desire, emotion, will, and feeling.

The defense of morals is the battle-cry which best rallies stupidity against change.

Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.

The whole of mathematics consists in the organization of a series of aids to the imagination in the process of reasoning.