I am both pleased but astonished by the fact that mankind has not yet begun to use all the means and devices that are available for destruction. I hope that such weapons are never manufactured in quantity.

I was at the foot of my class.

I did not fail two thousand times. I merely found two thousand ways not to make a lightbulb.

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.

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.

I do not believe in the God of the theologians; but that there is a Supreme Intelligence I do not doubt.

I have been at work for some time building an apparatus to see if it is possible for personalities which have left this earth to communicate with us.