In everything， there is a limit beyond which we cannot go.
在任何事情中，都存在一个我们无法逾越的界限。
When you do something best in life, you don’t really want to give that up – and for me it’s tennis.
债务要么产生于契约，要么产生于侵权行为。
Don't worry about failures, worry about the chances you miss when you don't even try.
我们不需要魔法来改变世界，我们内心已经拥有所需的力量。