Expect problems and eat them for breakfast.
By failing to prepare, you are preparing to fail.
The wise does at once what the fool does at last.
Never complain and never explain.
Always desire to learn something useful.
Be kind whenever possible. It is always possible.
You never know what motivates you.
What you do today can improve all your tomorrows.
If you think you can do it, you can.
Know or listen to those who know.
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.