The flesh is sad, alas, and I have read all the books.

It requires indeed some courage to undertake a labor of such far-reaching extent.

历史学家必须怀有一种信念：人类不会也不能灭亡。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

我愿你快乐，即使你的快乐不再是因为我。