My email signatures historically contained quotes like
If you believe in yourself and have dedication and pride and never quit, you’ll be a winner. The price of victory is high but so are the rewards. —Paul “Bear” Bryant
Losing doesn’t make me want to quit. It makes me want to fight that much harder. —Paul “Bear” Bryant
Never quit. Set a goal and don’t quit until you attain it. When you do attain it, set another goal, and don’t quit until you reach it. Never quit. —Paul “Bear” Bryant
Disobedience is the true foundation of liberty. The obedient must be slaves. —Henry David Thoreau
Knowledge has to be improved, challenged, and increased constantly, or it vanishes. —Peter F. Drucker
If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them. —Henry David Thoreau