A man's manners are a mirror in which he shows his portrait.

Neither art thou the man to catch the fiend and hold him! [Ger., Du bist noch nicht der Mann den Teufel festzuhalten.

Whoever, in middle age, attempts to realize the wishes and hopes of his early youth, invariably deceives himself. Each ten years of a man's life has its own fortunes, its own hopes, its own desires.

The artist may be well advised to keep his work to himself till it is completed, because no one can readily help him or advise him with it... but the scientist is wiser not to withhold a single finding or a single conjecture from publicity.

The realization of the self is only possible if one is productive, if one can give birth to one's own potentialities.

For usually people resist as long as they can to dismiss the fool they harbor in their bosom, they resist to confess a major mistake or to admit a truth that makes them despair.

Wer fremde Sprachen nicht kennt, weiss nichts von seiner eigenen.He who is ignorant of foreign languages, knows not his own.