When people will not weed their own minds, they are apt to be overrun with nettles. – Horace Walpole, letter to the Countess of Ailesbury, 1779 July 10th

That’s the classical mind at work, runs fine inside but looks dingy on the surface. – Robert M. Pirsig

The mind is like a trunk: if well-packed, it holds almost every thing; if ill-packed, next to nothing. – Augustus William Hare and Julius Charles Hare, Guesses at Truth, by Two Brothers

Impressions arriving at the brain make it enter into activity, just as food falling into the stomach excites it to more abundant secretion of gastric juice. – Pierre Cabanis, translated from French