Whether some of these class as quotes, I don't know, but I thought this would be the best place to post them in any case.
I have not slept,
Between the acting of a dreadful thing
And the first motion, all the interim is
Like a phantasma, or a hideous dream:
The Genius and the mortal instruments
And then in council; and the state of man,
Like to a little kingdom, suffers then
The nature of an insurrection.
William Shakespeare, Julius Caesar
I sung of Chaos and eternal Night,
Taught by the heav'nly Muse to venture down
The dark descent, and up to reascend . . .
John Milton, Paradise Lost
The descent beckons
as the ascent beckoned.
William Carlos Williams, The Descent
Doctors-Men who prescribe medicens of which they know little, to cure diseases of which they know less, in human beings of whom they know nothing (Voltaire)
War - God's way of teaching Americans geography (Ambrose Bierce)
Affectionate-Addicted to being a nuisance. The most affectionate creature in the world is a wet dog (Ambrose Bierce)
Psychology-The theory that the patient will probably get well anyhow, and is certainly a damned fool (H. L. Mencken)
Pun-The lowest form of wit -- unless you thought of it first (Anon)
Life; a scathing magnitude that cares nothing for the wellbeing of any meaningless being. (Me)