Well done is better than well said.
If you can dream it, you can do it.
Problems are not stop signs, they are guidelines.
You never know what motivates you.
What you do today can improve all your tomorrows.
To be a good loser is to learn how to win.
After a storm comes a calm.
The secret of getting ahead is getting started.
Either you run the day or the day runs you.
Leap, and the net will appear.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.