阅读使人充实,谈论使人机敏,写作使人精确。
In mathematics, you don't understand things. You just get used to them.
My philosophy of life is: smile at life and never give up.
你能给孩子最好的礼物是责任的根和独立的翅膀。
——2000年10月18日出席西雅图一次会议时的发言