Confucius (c. 551-479 BCE)
“Only one who bursts with eagerness do I instruct; only one who bubbles with excitement, do I enlighten. If I hold up one corner and a man cannot come back to me with the other three, I do not continue the lesson.”
- The Analects of Confucius (Book VII, section 8) translated by Arthur Waley (Vintage Books, 1989).