Religion is the reaction of human nature to its search for God.

Algebra is the intellectual instrument which has been created for rendering clear the quantitative aspects of the world.

An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.

I put forward as a general definition of civilization, that a civilized society is exhibiting the five qualities of Truth, Beauty, Adventure, Art, Peace.

In all education the main cause of failure is staleness.

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

Learning preserves the errors of the past, as well as its wisdom. For this reason, dictionaries are public dangers, although they are necessities.