“When you know something, you know it, and when you don't, you'd better learn. And in the meantime, you should keep quiet, or at least speak only when what you say will advance the learning process.”

“When you are crazy you learn to keep quiet.”

“When you talk, you repeat what you already know; when you listen, you often learn something.”

“Learn to say no when you know that you are only being used for others benefit.”

“Education does not take place when you learn something you did not know before. Education is your ability to use what you have learned to be better today than you were yesterday.”

“You only learn when you give your whole being to something. When you give your whole being to mathematics,you learn; but when you are in a state of contradiction, when you do not want to learn but are forced to learn, then it becomes merely a process of accumulation. To learn is like reading a novel with innumerable characters; it requires your full attention, not contradictory attention.”