Nobel laureate, Holocaust survivor and peace advocate Elie Wiesel has seen the best -- and worst -- of human nature, and he believes that the greatest offering any one person can give to humanity is the gift of friendship. "To me, friendship is a religion," he tells Oprah Winfrey in this clip from "Super Soul Sunday." "We couldn't live without it. Perhaps we could live for a while without love, but not without friendship." "Super Soul Sunday" airs Sunday mornings on OWN.