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"Men do not mirror themselves in running water, they mirror themselves in still water. Only what is still can still the stillness of other things." – Zhuangzi, Ch. 5
"Do you not see how necessary a World of Pains and troubles is to school an Intelligence and make it a Soul?" – John Keats, Letter to George and Georgiana Keats, April 1819.
The Master said, "Yu, shall I teach you what knowledge is? When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it; — this is knowledge." – Confucius in 'The Analects' (2:17).