The essence of mathematics lies in its freedom.

世界是一本书，不旅行的人只读了一页。

The study of truth requires a considerable effort - which is why few are willing to undertake it out of love of knowledge - despite the fact that God has implanted a natural appetite for such knowledge in the minds of men.

大爆炸不是一切的开始，而是我们可观测宇宙的开始。