Be gentle to all and stern with yourself.
Know or listen to those who know.
To be a good loser is to learn how to win.
Well done is better than well said.
Things do not happen. Things are made to happen.
Expect problems and eat them for breakfast.
You never know what motivates you.
The wise does at once what the fool does at last.
Always desire to learn something useful.
If you're going through hell, keep going.
It's amazing that something only an atom thick can be an impenetrable barrier. You can have gas on one side and vacuum or liquid on the other, and with a wall only one atom thick, nothing would go through it.