I can, therefore I am.
Things do not happen. Things are made to happen.
Problems are not stop signs, they are guidelines.
Well done is better than well said.
Be kind whenever possible. It is always possible.
It's always too early to quit.
Be thine own palace, or the world's thy jail.
Be gentle to all and stern with yourself.
Never complain and never explain.
The dog that trots about finds a bone.
I love the wry motto of the Paleontological Society, meant both literally and figuratively, for hammers are the main tool of our trade: Frango ut patefaciam - I break in order to reveal.