The past is a shadow that follows us, but the future is a light that guides us.
过去是跟随我们的影子，但未来是引导我们的光。
"To think is to confine yourself to a single thought that one day stands still like a star in the world's sky."
每一个优秀的数学家至少是半个哲学家，而每一个优秀的哲学家至少是半个数学家。