How to deal with depression and relieve stress and anxiety

This is from KB at KtotheB.com.  It's a great video and really makes you think.  The main concepts are from Byron Katie, who has some amazing information on her website.

When you have thoughts enter into your mind, ask yourself these four questions so that you may further examine your thoughts:

1. Is it true?
2. Can you absolutely know that it's true?
3. How do you react when you believe that thought?
4. Who would you be without that thought?