tennis is, without a doubt, a very arduous sport. So when a particular practice, match, tournament, or loss haunts you, think back to why you started playing tennis in the first place and reassess your current situation.
After what I know someone close to me is going through, I will never take my sport for granted again. If you are out on an injury... Stay Strong... Don't listen to that little voice in your head that tells you to give up. Be ready to say "I told you"
Athlete's Creed, Thank you for whoever made this. Not all sportsmen believe this, and it's sad. If you don't want more from yourself, get out of the way of those that do. Don't quit, just get out of the way.