To know oneself, one should assert oneself.
What you do today can improve all your tomorrows.
Problems are not stop signs, they are guidelines.
It's always too early to quit.
The wise does at once what the fool does at last.
Only the educated are free.
Be kind whenever possible. It is always possible.
Without hard work, nothing grows but weeds.
If you can dream it, you can do it.
If you've got a talent, protect it.
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.