I don't think you can ever do your best. Doing your best is a process of trying to do your best.

真正的挑战不是生产更多粮食，而是用更少的浪费更聪明地种植。

在基本粒子的领域里，物质和力的区别变得模糊。

Mathematics is not just a collection of abstract concepts, but a language that allows us to understand the universe.

The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.

有时候，最艰难的战斗是在我们自己的脑海中进行的。

勇气是面对恐惧时的坚持。

You cannot not know history.

过去无法改变，但未来可以。