A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

I'm a pessimist. But I'm a pessimist with a sense of responsibility.

A pessimist is a man who thinks everybody is as nasty as himself, and hates them for it.

It's better to be an optimist who is sometimes wrong than a pessimist who is always right.

Let me declare expressly that in the days when mankind was not yet ashamed of its cruelty, life on earth was more cheerful than it is now that pessimists exist.

Pessimism is a form of mental dipsomania; it disdains healthy nourishment, indulges in the strong drink of denunciation, and creates an artificial dejection which thirsts for a stronger draught.