"The world is a book, and those who do not travel read only one page."

The theory of automorphic forms is a central subject in modern number theory.

I quite agree with them that it is not an ennobling experience. Poverty entails fear, and stress, and sometimes depression; it means a thousand petty humiliations and hardships. Climbing out of poverty by your own efforts, that is indeed something on which to pride yourself, but poverty itself is romanticised only by fools.

过去并没有死去；它甚至还没有过去。