Never complain and never explain.
What you do today can improve all your tomorrows.
Problems are not stop signs, they are guidelines.
Do not weep do not wax indignant. Understand.
If you think you can do it, you can.
Be gentle to all and stern with yourself.
To know oneself, one should assert oneself.
Quality is not an act, it is a habit.
Be kind whenever possible. It is always possible.
Well done is better than well said.
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.