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

The history of liberty is a history of resistance.

There is no higher religion than human service. To work for the common good is the greatest creed.

The only use of an obstacle is to be overcome. All that an obstacle does with brave men is, not to frighten them, but to challenge them.

If a dog will not come to you after having looked you in the face, you should go home and examine your conscience.

We are not here merely to make a living. We are here to enrich the world.

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.

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.

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

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.