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

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

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

Agnostic for me would be trying to weasel out and sound a little nicer than I am about this.

By honest I don't mean that you only tell what's true. But you make clear the entire situation. You make clear all the information that is required for somebody else who is intelligent to make up their mind.

When a scientist doesn't know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty - some most unsure, some nearly sure, but none absolutely certain.

In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.