Because ideas have to be original only with regard to their adaptation to the problem at hand, I am always extremely interested in how others have used used them.

Many a person who could not comprehend Rousseau, and would be puzzled by Montesquieu, could understand Paine as an open book. He wrote with a clarity, a sharpness of outline and exactness of speech that even a schoolboy should be able to grasp.

I believe in the existence of a Supreme Intelligence pervading the Universe.

Genius is one percent inspiration, ninety-nine percent perspiration.

I have not failed. I have successfully discovered 1200 ideas that don't work.

Be brave as your fathers before you. Have faith and go forward.

Success is the result of hard work.