The United States is the most powerful country in the world, and it will remain so for the foreseeable future.

The vision of a champion is someone who is bent over, drenched in sweat, at the point of exhaustion when no one else is watching.

What we need to do is not to follow, but to lead.

我在网球上取得的成就是伟大的，但我作为一个人是谁更重要。