Who is the most sensible person? The one who finds what is to their own advantage in all that happens to them.

Impotent hatred is the most horrible of all emotions; one should hate nobody whom one cannot destroy.

Everything factual is, in a sense, theory. The blue of the sky exhibits the basic laws of chromatics. There is no sense in looking for something behind phenomena: they are theory.

A teacher who can arouse a feeling for one single good action, for one single good poem, accomplishes more than he who fills our memory with rows and rows of natural objects, classified with name and form.

Man's highest merit always is, as much as possible, to rule external circumstances and as little as possible to let himself be ruled by them.

No one has ever learned fully to know themselves.

The phrases that men hear or repeat continually, end by becoming convictions and ossify the organs of intelligence.