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

I would construct and work along various lines until I found them untenable. When one theory was discarded, I developed another at once. I realized very early that this was the only possible way for me to work out all the problems.

Waste is worse than loss. The time is coming when every person who lays claim to ability will keep the question of waste before him constantly. The scope of thrift is limitless.

I am afraid of radium and polonium ... I don't want to monkey with them.

Consider data without prejudice.

I believe that the science of chemistry alone almost proves the existence of an intelligent creator.

Every wrong attempt discarded is another step forward