Always desire to learn something useful.
It's always too early to quit.
If you've got a talent, protect it.
If you're going through hell, keep going.
Be gentle to all and stern with yourself.
Go for it now. The future is promised to no one.
The wise does at once what the fool does at last.
Quality is not an act, it is a habit.
Expect problems and eat them for breakfast.
What you do today can improve all your tomorrows.
It's very expensive to be a professional tennis player with all the travel and the flights and the hotels and everything.