 It takes a lot of faith to think a booger, a piece of goo, turned into that thing that does all that it does. This human eye. That's evolution, the essence of it. The book is Why I Believe by Dr. Henry Cloud, New York Times bestselling author of Boundaries and many others many times over. He's been informing you about a lot of things in your life over the years. And now he's talking about why he believes.