My mind is incapable of conceiving such a thing as a soul. I may be in error, and man may have a soul; but I simply do not believe it. What a soul ma… - Thomas Edison

I never did anything worth doing by accident, nor did any of my inventions come indirectly through accident, except the phonograph. No, when I have, fully decided that a result is worth getting, I go about it, and make trial after trial, until it comes.

The memory of Tom Paine will outlive all this. No man who helped to lay the foundations of our liberty — who stepped forth as the champion of so difficult a cause — can be permanently obscured by such attacks. Tom Paine should be read by his countrymen. I commend his fame to their hands.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.