The real challenge is not in solving the equations, but in understanding what the solutions mean.

坚持与固执之间的区别在于一个源自坚强的意志，另一个源自坚强的拒绝。

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

我们都被某些东西所困扰。

希望是黑暗中的一束光。