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.

To those searching for truth -- not the truth of dogma and darkness but the truth brought by reason, search, examination, and inquiry, discipline is required. For faith, as well intentioned as it may be, must be built on facts, not fiction -- faith in fiction is a damnable false hope.

Oh these mathematicians make me tired! When you ask them to work out a sum they take a piece of paper, cover it with rows of A's, B's, and X's and Y's ... scatter a mess of flyspecks over them, and then give you an answer that's all wrong!

A teacher sent the following note home with a six-year-old boy 'He is too stupid to learn.' That boy was Thomas A. Edison.

If I could solve all the problems myself, I would.

We are striking it big in the electric light, better than my vivid imagination first conceived. Where this thing is going to stop Lord only knows.

Before you reject an idea, find at least five good things about it.