You never know what motivates you.
The wise does at once what the fool does at last.
If you think you can do it, you can.
Things do not happen. Things are made to happen.
Leap, and the net will appear.
If you're going through hell, keep going.
Expect problems and eat them for breakfast.
It's always too early to quit.
Only the educated are free.
To know oneself, one should assert oneself.
It's very expensive to be a professional tennis player with all the travel and the flights and the hotels and everything.