The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific "truth." But what is the source of knowledge? Where do the laws that are to be tested come from? Experiment, itself, helps to produce these laws, in the sense that it gives us hints. But also needed is imagination to create from these hints the great generalizations--to guess at the wonderful, simple, but very strange patterns beneath them all, and then to experiment to check again whether we have made the right guess.

Some people think Wheeler's gotten crazy in his later years, but he's always been crazy.

There's plenty of room at the bottom.

The game I play is a very interesting one. It's imagination, in a tight straightjacket.

Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

Experiment is the sole judge of the validity of any idea.

Nobody ever figures out what life is all about, and it doesn't matter. Explore the world. Nearly everything is really interesting if you go into it deeply enough.