If you can dream it, you can do it.
Problems are not stop signs, they are guidelines.
Be gentle to all and stern with yourself.
If you think you can do it, you can.
Things do not happen. Things are made to happen.
To be a good loser is to learn how to win.
Quality is not an act, it is a habit.
Wherever you are - be all there.
If you're going through hell, keep going.
You never know what motivates you.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.