The first forty years of life give us the text; the next thirty supply the commentary on it.

Boredom is just the reverse side of fascination: both depend on being outside rather than inside a situation, and one leads to the other.

Philosophy ... is a science, and as such has no articles of faith; accordingly, in it nothing can be assumed as existing except what is either positively given empirically, or demonstrated through indubitable conclusions.

Every child is in a way a genius; and every genius is in a way a child.

Materialism is the philosophy of the subject who forgets to take account of himself.

Happiness consists in frequent repetition of pleasure

We forfeit three-quarters of ourselves in order to be like other people.