If you want to make enemies, try to change something.

When correcting a child, the goal is to apply light, not heat.

Progressiveness means not standing still when everything else is moving.

I would rather lose in a cause that will some day win, than win in a cause that will some day lose.

Life does not consist in thinking, it consists in acting.

We are not put into this world to sit still and know; we are put into it to act.

If you've made up your mind you can do something, you're absolutely RIGHT.

The ear of the leader must ring with the voices of the people.

We are citizens of the world. The tragedy of our times is that we do not know this.

The difference between a strong man and a weak one is that the former does not give up after a defeat.

I used to do a lot of video analysis early on, but more for pleasure and looking at my own technique.

What I think I've been able to do well over the years is play with pain, play with problems, play in all sorts of conditions.

Early in my career, I had no consistency. Now I'm the most consistent player on the tour. It feels pretty good.

Hopefully, I can just have another terrible year with only the one Grand Slam and that will be just fine.

I always had the dream that, once I became No 1 in the world, that if I had a child I hoped I would have it early enough so the child can see me playing.

It's not so simple to just stay in the moment and trust your game and your strength that you can turn it around.

Once you reach a good level in tennis it fills you with a lot of motivation. I hope I can do it for a long time.

The crowds are very important for tennis. It makes you play better, but it can also make you nervous and that's the beauty of it.

One should just be able to play a perfect game.