It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.  

The goal of mathematics is not to solve problems, but to understand them.

牺牲自由以换取安全（可指生活保障）的人，不配有自由和安全。

有时候，你必须和你爱的人分开，但这并不会让你爱他们少一点。有时候，这会让你更爱他们。