I always had the theory that the most important thing is be happy, enjoy what are you doing, and be fresh mentally.

I always had the theory that the most important thing is be happy, enjoy what are you doing, and be fresh mentally.

我一直认为，最重要的事情是快乐，享受你所做的事情，保持头脑清醒。

-- Rafael Nadal 拉菲尔·纳达尔