Be thine own palace, or the world's thy jail.
By failing to prepare, you are preparing to fail.
If you think you can do it, you can.
Be gentle to all and stern with yourself.
The secret of getting ahead is getting started.
Problems are not stop signs, they are guidelines.
It's always too early to quit.
Things do not happen. Things are made to happen.
Always desire to learn something useful.
The most effective way to do it, is to do it.
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.