The ideas I use are mostly the ideas of people who don't develop them

Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged.

If there is a way to do it better...find it.

There's a way to do it better - find it.

I shall make electricity so cheap that only the rich can afford to burn candles

To invent, you need a good imagination and a pile of junk.