The only real mistake is the one from which we learn nothing.

解释：割地给秦国（来求得暂时的安稳），就好像抱着木柴救火一样，木柴烧不不完，火就不会灭。

The secret of a good old age is simply an honorable pact with solitude.

我认为最重要的是要对自己真实，对自己诚实。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

The measure of a good book is whether it makes you think, feel, and see the world differently.