The past is never dead. It's not even past.

"Light is the key. Without light, there is no image."

Everyone is worthy of love, except him who thinks that he is.

先有完善的法律制度，然后才能有治理国家的人才

The art of doing mathematics consists in finding that special case which contains all the germs of generality.

我一直都是独自一人，但我从不感到孤独。