The most important thing in mathematics is to understand the concepts, not just to memorize formulas.

The secret of success is learning how to use pain and pleasure instead of having pain and pleasure use you. If you do that, you’re in control of your life. If you don’t, life controls you.

I think goals should never be easy, they should force you to work, even if they are uncomfortable at the time.

最有力的艺术往往是最模糊的。