Pour some water into a tub and stir it up. Now try as hard as you can to calm the water with your hands; you will succeed in agitating it further. Let it stand undisturbed a while, and it will calm down by itself. The human brain works much the same way. – Koichi Tohei, Ki in Daily Life
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