The greatest invention in the world is the mind of a child.

The world owes nothing to any man, but every man owes something to the world.

I cannot believe in the immortality of the soul. No, all this talk of an existence for us, as individuals, beyond the grave is wrong. It is born of our tenacity of life - our desire to go on living - our dread of coming to an end.

The only thing I use my body for is to carry my brain around.

X-rays ... I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms.

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.

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