He who can, does. He who cannot, teaches.

In heaven an angel is nobody in particular.

Virtue consists, not in abstaining from vice, but in not desiring it.

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

Happiness and beauty are by-products.

It is dangerous to be sincere unless you are also stupid.

Titles distinguish the mediocre, embarrass the superior, and are disgraced by the inferior.

Beware of the man who does not return your blow: he neither forgives you nor allows you to forgive yourself.

The golden rule is that there are no golden rules.