Science is a force for good, but only if we use it wisely.

"I couldn’t be in a play because plays are not real life and they are full of people doing things that don’t make sense."

The freedom of thought is the most precious freedom.

心有成见，就好像用水浇石头，水一点都进不去；对事理不能领悟，则拘泥而不变通，一点都转动不得。

Tennis is a mental game. Everyone is fit, everyone hits great forehands and backhands – it’s the upstairs that counts.