Pessimist: One who, when he has the choice of two evils, chooses both.

I hope to-morrow will be a fine day, Lane.
It never is, sir.
Lane, you're a perfect pessimist.
I do my best to give satisfaction, sir.

SIR ROBERT CHILTERN: … But may I ask, at heart, are you an optimist or a pessimist? Those seem to be the only two fashionable religions left to us nowadays.
MRS CHEVELEY: Oh, I'm neither. Optimism begins in a broad grin, and Pessimism ends with blue spectacles. Besides, they are both of them merely poses.
SIR ROBERT CHILTERN: You prefer to be natural?
MRS CHEVELEY: Sometimes. But it is such a very difficult pose to keep up.

(Act I., lines 132-140)

Every impulse we strangle will only poison us.

The mark of all good art is not that the thing done is done exactly or finely, for machinery may do as much, but that it is worked out with the head and the workman's heart.

You will always be fond of me. I represent to you all the sins you have never had the courage to commit.