The historian must have a kind of faith that humanity will not and cannot perish.
历史学家必须怀有一种信念:人类不会也不能灭亡。
预测未来的最好方法就是自己去创造它。
知道自己不知道什么比聪明更有用。
Mathematics advances not by the efforts of individuals alone but through the collective work of generations.