Things do not happen. Things are made to happen.
Wherever you are - be all there.
Always desire to learn something useful.
Well done is better than well said.
Be gentle to all and stern with yourself.
It's always too early to quit.
Expect problems and eat them for breakfast.
Begin to be now what you will be hereafter.
Without hard work, nothing grows but weeds.
Do not weep do not wax indignant. Understand.
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.