Never complain and never explain.
Be gentle to all and stern with yourself.
Be thine own palace, or the world's thy jail.
Always desire to learn something useful.
The dog that trots about finds a bone.
Go for it now. The future is promised to no one.
To be a good loser is to learn how to win.
It's always too early to quit.
Know or listen to those who know.
What you do today can improve all your tomorrows.
Leave the atom alone.