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Bitterness

Any idiot can face a crisis; it is this day-to-day living that wears you out.
Anton Chekhov
There is no fate that cannot be surmounted by scorn.
Albert Camus
Every normal man must be tempted at times to spit upon his hands, hoist the black flag and begin slitting throats.
H.L. Mencken
Hell is other people.
Jean-Paul Sartre
True friends stab you in the front.
Oscar Wilde
The power of accurate observation is commonly called cynicism by those who have not got it.
George Bernard Shaw