The mind will ever be unstable that has only prejudices to rest on.
孔子说:“读书不想事,越学越糊涂;想事不读书,越想越头痛。”
"The writer is the conscience of society."
The elegance of a mathematical proof is in its simplicity and clarity.
以“我是对的”那样充满自信地讲话,但要以“我是错的”那样去聆听。