Inspirational Quotes, Motivational Sayings, and Wise Words for Daily Inspiration

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Unless a thing can be defined by measurement, it has no place in a theory. And since an accurate value of the momentum of a localized particle cannot be defined by measurement it therefore has no place in the theory.

Richard P. Feynman's Popular Quotes

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

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

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

- Richard P. Feynman

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

- 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

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