"Tennis is a mental game. Everyone is fit, everyone hits great shots."

When we love, we always strive to become better than we are. 

生活若无波折险阻，就会过于平淡无奇。

I think it's important to have a good hard failure when you're young... I learned a lot from that. Because it makes you kind of aware of what can happen to you. Because of it, I've never had any fear in my whole life when we've been near collapse and so on. I've never been afraid.

我们都是自己经历的囚徒，而自由的关键在于理解这些经历。

心理学的研究不仅仅是理解他人；它也是关于理解我们自己以及我们如何与周围的世界互动。