This Sunday, it's all about life's big questions. Look back at some of the best moments we've had with Marianne Williamson, Deepak Chopra, Eckhart Tolle, Gary Zukav, Wayne Dyer and more! Plus, we'll also have some never-before-seen insight that will keep those lightbulb moments coming. Watch a preview above!

Then tune in Sunday, December 16, at 11 a.m. ET/PT on OWN, or join our worldwide simulcast on Oprah.com or Facebook.com/SuperSoulSunday.