Spiritual teacher Iyanla Vanzant says you can't believe in God if you believe darkness and evil will win in this world. Find out how she sees good happening all over the world.

Watch Oprah and Iyanla's full interview at 11 a.m. ET/PT on OWN. You can also watch from anywhere in the world on Oprah.com, Facebook.com/OWNTV or Facebook.com/SuperSoulSunday.