The greatest of follies is to sacrifice health for any other kind of happiness.

Where there is no love, a person's faithfulness to the marriage bond is probably against nature.

To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it.

Animals hear about death for the first time when they die.

All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.

No one knows what capacities for doing and suffering he has in himself, until something comes to rouse them to activity: just as in a pond of still water, lying there like a mirror, there is no sign of the roar and thunder with which it can leap from the precipice, and yet remain what it is; or again, rise high in the air as a fountain. When water is as cold as ice, you can have no idea of the latent warmth contained in it.

The man who goes up in a balloon does not feel as if he were ascending; he only sees the earth sinking deeper below him.