If your art doesn’t challenge you, it won’t challenge anyone else.

The farmer is the only man in our economy who has to buy everything at retail, sell everything at wholesale, and pay the freight both ways.

We're not trying to preach, we're just trying to teach.

The more you know, the less you need.

The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

The key to performance is elegance, not battalions of special cases.

You have to be able to laugh at yourself and not take yourself too seriously.