Byron Katie’s books and her 4-step process (called “the work”) have changed my life. The easiest way to see what she does is by watching her do “the work” on YouTube. Here is a link to one of her videos: https://youtu.be/ApZ798fOG78
Here is a link to her book “Loving What Is: Four Questions That Can Change Your Life” https://www.amazon.com/dp/1400045371