He was a third-generation specialist in the nature of speech, and he knew that for the transmission of spoken words there must be "a pulsatory action of the electric current which is the exact equivalent of the aerial impulses." Bell knew just enough about electricity, and not too much.

He did not know the possible from the impossible.

"Had I known more about electricity, and less about sound," he said, "I would never have invented the telephone." What he had done was so amazing, so foolhardy, that no trained electrician could have thought of it.

It was "the very hardihood of invention," and yet it was not in any sense a chance discovery.

It was the natural output of a mind that had been led to assemble just the right materials for such a product.
As though the very stars in their courses were working for this young wizard with the talking wire, the Centennial Exposition in Philadelphia opened its doors exactly two months after the telephone had learned to talk.