It's always too early to quit.
If you can dream it, you can do it.
Be thine own palace, or the world's thy jail.
The dog that trots about finds a bone.
Know or listen to those who know.
Never complain and never explain.
Expect problems and eat them for breakfast.
If you think you can do it, you can.
The secret of getting ahead is getting started.
Be gentle to all and stern with yourself.
Imagination is as vital to any advance in science as learning and precision are essential for starting points.