All communication must lead to change

The same ideas, one must believe, recur in men's minds not once or twice but again and again.

Philosophy can make people sick.

Everybody loves a thing more if it has cost him trouble: for instance those who have made money love money more than those who have inherited it.

To the sober person adventurous conduct often seems insanity.

Courage is the first of human qualities because it is the quality which guarantees the others.

The character which results from wealth is that of a prosperous fool.