Thomas Jefferson

The most valuable of all talents is that of never using two words when one will do.
He who permits himself to tell a lie once, finds it easier to do it a second time.
A mind always employed is always happy.
Never trouble another for what you can do for yourself.
Whenever you do a thing, though it can never be known but to yourself, ask yourself how you would act were all the world looking at you, and act accordingly.