"I am more of a sponge than a scientist."

"I am not discouraged, because every wrong attempt discarded is another step forward."

"My main purpose in life is to make money so that I can afford to carry on more experiments."

"The three great essentials to achieve anything worthwhile are, first, hard work; second, stick-to-itiveness; third, common sense."

"We will make electricity so cheap that only the rich will burn candles."