You never know what motivates you.
The secret of getting ahead is getting started.
If you think you can do it, you can.
Go for it now. The future is promised to no one.
Be thine own palace, or the world's thy jail.
Problems are not stop signs, they are guidelines.
Only the educated are free.
To be a good loser is to learn how to win.
By failing to prepare, you are preparing to fail.
It's always too early to quit.
I am a teacher, and I am proud of it. At Cornell University I have taught primarily undergraduates, and indeed almost every year since 1966 have taught first-year general chemistry.