All truly wise thoughts have been thought already thousands of times; but to make them truly ours, we must think them over again honestly, until they take root in our personal experience.

The best government is that which teaches us to govern ourselves.

Since you know me and my destiny only too well, you probably also know what attracts me to all unfortunate people.

We can stand only a certain amount of unhappiness; anything beyond that annihilates us or passes us by, leaving us apathethetic.

The art of living rightly is like all arts; it must be learned and practiced with incessant care.

Accepting good advice means nothing other than to strengthen one's own ability.

Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.