The field of experience is the whole universe in all directions. Theory remains shut up within the limits of human faculties.

Great necessity elevates man, petty necessity casts him down

No limit, no definition, may restrict the range or depth of the human spirit's passage into its own secrets or the world's.

If one mistreats citizens of foreign countries, one infringes upon one's duty toward one's own subjects; for thus one exposes themto the law of retribution.

Ambition and love are the wings of great actions.

It is said that no man is a hero to his valet. That is because a hero can be recognized only by a hero.

He is happy as well as great who needs neither to obey nor to command in order to be something.