This Sunday, Oprah sits beneath the oaks of her California home with author and Sufi teacher Llewellyn Vaughan-Lee to talk about love and the source of true happiness. Watch a sneak peek of his interview with Oprah.

Oprah's interview with Llewellyn Vaughan-Lee airs Sunday at 11 a.m. ET/PT on OWN. You can also watch our simulcast anywhere from the world on Oprah.com, Facebook.com/OWN or Facebook.com/SuperSoulSunday!