One main factor in the upward trend of animal life has been the power of wandering.

That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.

Other nations of different habits are not enemies: they are godsends. Men require of their neighbours something sufficiently akin to be understood, something sufficiently different to provoke attention, and something great enough to command admiration. We must not expect, however, all the virtues.

One main factor in the upward trend of animal life has been the power of wandering.

Fertilization of the soul is the reason for the necessity of art.

The pursuit of mathematics is a divine madness of the human spirit.

Without adventure civilization is in full decay.