Never complain and never explain.
It's always too early to quit.
Expect problems and eat them for breakfast.
Do not weep do not wax indignant. Understand.
Without hard work, nothing grows but weeds.
Leap, and the net will appear.
Be gentle to all and stern with yourself.
I can, therefore I am.
Things do not happen. Things are made to happen.
Quality is not an act, it is a habit.
One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.