Glinda the Good Witch isn't just a goody-two-shoes. She's also one of Oprah's favorite spiritual teachers. During a conversation with thought leader Jean Houston about the life lessons everyone can learn from 'The Wizard of Oz,' Oprah opens up about how Glinda's simple words -- 'You've always had the power' -- have never left her. Oprah's conversation with Jean Houston on 'Super Soul Sunday' airs at 11 a.m. ET on Sunday, Nov. 25 on OWN.