Never esteem anything as of advantage to you that will make you break your word or lose your self-respect.
I believe that all government is evil, and that trying to improve it is largely a waste of time.
The secret of greatness is simple: do better work than any other man in your field - and keep on doing it.
It is never too late to give up our prejudices.
The undertaking of a new action brings new strength.
There are sadistic scientists who hurry to hunt down errors instead of establishing the truth.
Act as if it were impossible to fail.