一个人笑的时间是与众神共度的时间。

最聪明的人都是自学成才的，即便他们在学校上过学。

The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.

成功不是终点，失败也并非致命，重要的是继续前进的勇气。

数学的本质在于它的自由。