A good mathematician is someone who can see analogies between theorems; a great mathematician is someone who can see analogies between analogies.
一个好的数学家是能看到定理之间类比的人;一个伟大的数学家是能看到类比之间的类比的人。
青年的危机不是生物性的,而是社会和政治性的,它需要一种新的语言来理解他们斗争性质的变化。
The past is a foreign country; they do things differently there.