Go for it now. The future is promised to no one.
Be gentle to all and stern with yourself.
It's always too early to quit.
You never know what motivates you.
Quality is not an act, it is a habit.
To know oneself, one should assert oneself.
The dog that trots about finds a bone.
I can, therefore I am.
Expect problems and eat them for breakfast.
Never complain and never explain.
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.