The essence of mathematics lies in its freedom.
Persistence is just as important as intelligence in research.
The world is a question, not an answer.
成功的道路总是在建设中。
Man is the creator of his destiny, not its slave.
"The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion."