优秀的数学家不是知道所有答案的人，而是能提出正确问题的人。
A good mathematician is not one who knows all the answers, but one who asks the right questions.
The worth of a mental process is in its service to life.
保卫国家政权，是那些君主和臣子等享受俸禄的人谋划的事；保卫整个天下，即使是地位低微的普通百姓也有责任参与。
美好的社会是美德得到回报的社会。
The heart of a poet is a mirror that reflects the beauty and the pain of the world.
——1981