Quality is not an act, it is a habit.
Expect problems and eat them for breakfast.
Without hard work, nothing grows but weeds.
It's always too early to quit.
The wise does at once what the fool does at last.
Always desire to learn something useful.
You never know what motivates you.
Wherever you are - be all there.
Be kind whenever possible. It is always possible.
If you're going through hell, keep going.
I have taught history on the high school and college levels, and am or have been a lecturer at the Smithsonian, The National Institutes of Health, and numerous colleges and universities, mostly on science fiction and technology subjects.