I've never heard of anyone stumbling on something sitting down.

here is a great difference between knowing a thing and understanding it. You can know a lot and not really understand anything.

We have a lot of people revolutionizing the world because they've never had to present a working model.

If a fellow wants to be nobody in the business world, let him neglect sending the mailman to somebody on his behalf.

Research means that you don't know, but are willing to find out.

Inventing is a combination of brains and materials. The more brains you use, the less material you need.

Whenever you look at a piece of work and you think the fellow was crazy, then you want to pay some attention to that. One of you is likely to be, and you had better find out which one it is. It makes an awful lot of difference.