Tennis can be a grind and there's always the danger of going stale if you think about it too much. You can get embittered if you train too hard and have nothing else on your mind. You have to be able to relax between matches and between tournaments.
Tennis is more than just a sport. It's an art, like the ballet. Or like a performance in the theater. When I step on the court I feel like Anna Pavlova. Or like Adelina Patti. Or even like Sarah Bernhardt. I see the footlights in front of me. I hear the whisperings of the audience. I feel an icy shudder. Win or die! Now or never! It's the crisis of my life.