Date: w. c. 238
"Hence, the human heart-mind may be compared to a pan of water. If you place the pan upright and do not stir the water up, the mud will sink to the bottom, and the water on top will be clear and pure [qing ming] enough to see your beard and eyebrows and to examine the lines on your face."
preview | full record— Xunzi (died after 238 BC)