可怜的是那些快乐取决于他人许可的人。

The obligation of subjects to the sovereign is understood to last as long, and no longer, than the power lasteth by which he is able to protect them.

数据不是信息，信息不是知识，知识不是理解，理解不是智慧。

The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.

Each generation takes the earth as trustees.