It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about.
“But this emphasis would be lavished in vain, if it served, in your opinion, only to abstract a general type from phenomena whose particularity in our work would remain the essential thing for you, and whose original arrangement could be broken up only artificially.”
“If you can react the same way to winning and losing, that's a big accomplishment. That quality is important because it stays with you the rest of your life, and there's going to be a life after tennis that's a lot longer than your tennis life.”