I consider Paine our greatest political thinker. As we have not advanced, and perhaps never shall advance, beyond the Declaration and Constitution, so Paine has had no successors who extended his principles.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

The biggest failure of man is that he gives up before he realizes how close he was to success.

There's a way to do it better - find it.

To invent, you need a good imagination and a pile of junk.

I am much less interested in what is called God's word than in God's deeds. All bibles are man-made.

I never did anything by accident, nor did any of my inventions come by accident; they came by work.