Oprah calls spiritual teacher Marianne Williamson "the best prayer writer, sayer, giver that I have ever known." In a "Soul-to-Soul" special on "Super Soul Sunday," Oprah and Marianne go deep and talk about prayer, God, love, death and more. In this clip, during the course of a lightning round of questions, Marianne shares with Oprah her thoughts on some of life's most challenging questions. "Super Soul Sunday" airs Sundays on OWN at 11 a.m. ET.