You never know what motivates you.
Always desire to learn something useful.
Things do not happen. Things are made to happen.
What you do today can improve all your tomorrows.
Begin to be now what you will be hereafter.
Well done is better than well said.
It's always too early to quit.
Quality is not an act, it is a habit.
The dog that trots about finds a bone.
Either you run the day or the day runs you.
One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.