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

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

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

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

I'd rather be an optimist and a fool than a pessimist and right.

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.