The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
We don't inherit the earth from our ancestors; we borrow it from our children.
记忆是脆弱的，但它也是我们理解过去最强大的工具。
The conjectures of the Langlands program are not merely problems to be solved but a vision of how mathematics should be.