The day I stop believing I can win is the day I'll stop playing tennis.

I think the best moments in my career are the ones where I'm just completely surprised by something.

天才和愚蠢之间的区别就是天才有它的限制。

There is no such thing as innocence, only degrees of guilt.

The real challenge is not growing more, but growing better with fewer resources.

我跑步不是为了延长生命，而是为了给生命增添活力。

The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.

The language of mathematics is universal; it transcends all cultural barriers.