The opportunities of man are limited only by his imagination. But so few have imagination that there are ten thousand fiddlers to one composer.

I expect to spend the rest of my life in the future, so I want to be reasonably sure of what kind of future it's going to be. That is my reason for planning.

There has never been any 30-hour week for men who had anything to do.

Thinking is one thing no one has ever been able to tax.

You can send a message around the world in one-fifth of a second, yet it may take years for it to get from the outside of a man's head to the inside.

If I want to stop a research program I can always do it by getting a few experts to sit in on the subject, because they know right away that it was a fool thing to try in the first place.

It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again.