Collaboration in mathematics is essential; no one can solve all the problems alone.

听我说话就像一场头脑旅行，因为我只给你那些你和朋友在客厅里开玩笑的东西。

我不相信退休。我相信只要你有能力，就应该继续工作。

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.

成功来自于解决实际问题，而不仅仅是追逐趋势。