Oprah says author Eckhart Tolle has been one of the most profound wisdom teachers in her life. In this "Super Soul Sunday" sneak peek, watch Oprah reflect on Eckhart and reveal how he helped inspire Oprah's Lifeclass. Plus, find out what it really means when you have an aha! moment.

Tune in at 11 a.m. ET/PT Sunday, November 11, for Oprah's conversation with Eckhart Tolle. Watch it on OWN—or watch it worldwide on Oprah.com or Facebook.com/supersoulsunday.