We never are definitely right, we can only be sure we are wrong.

- Richard P. Feynman

I would rather have questions that can't be answered than answers that can't be questioned.

- Richard P. Feynman

The first principle is that you must not fool yourself and you are the easiest person to fool.

- Richard P. Feynman

It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

- Richard P. Feynman

If you can't explain something to a first year student, then you haven't really understood .

- Richard P. Feynman

Don't pay attention to "authorities," think for yourself.

- Richard P. Feynman

You can always recognize truth by its beauty and simplicity.

- Richard P. Feynman

Religion is a culture of faith; science is a culture of doubt.

- Richard P. Feynman

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."

- Richard P. Feynman