What you feel doesn’t matter in the end; it’s what you do that makes you brave.

Remember this. Hold on to this. This is the only perfection there is, the perfection of helping others. This is the only thing we can do that has any lasting meaning. This is why we're here. To make each other feel safe.

I suppose you could never say never, but my experience would tell me that the most successful players in the world are gonna come from an environment that is more competitive at an early age.

A strong body listens. It obeys. A weak body commands. If your body is weak it tells you what to do. If your body is strong it'll actually listen to you when you tell it to do something. If you build it right you can overcome some of the obstacles of age and recovery.

First of all, in any sport where you can measure distance, height speed and all of that, you see how athletes have changed their sport and made it better. I believe, with every generation, the sport has improved. Certainly, in the men's game, that has been the case. I think that I played Pete [Sampras] at his best, I played Roger [Federer] at his best.. I believe wholeheartedly that Roger and [Rafael] Nadal have pushed the game much further than myself or Pete ever did. Their options on the tennis court are considerably more than ours.

If you're ranked number one in the world it's because you've earned it, and I think the only way to really get there is to have that ability and to have it nurtured in a very competitive environment at an early age.

Tennis is the loneliest sport.