Wherever you are - be all there.
Begin to be now what you will be hereafter.
If you're going through hell, keep going.
What you do today can improve all your tomorrows.
Always desire to learn something useful.
Expect problems and eat them for breakfast.
Be kind whenever possible. It is always possible.
Without hard work, nothing grows but weeds.
It's always too early to quit.
Quality is not an act, it is a habit.
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.