02/13/2013 01:42 pm ET Updated Feb 20, 2013

Oprah On Faith, Obstacles... And The Mustard Seed (VIDEO)

In this clip from "Oprah's Lifeclass," Oprah says that one thing she knows for sure is, "You don't become what you want. Most times in life you don't even... get what you want."

She goes on to explain how, no matter what obstacles get in your way, even just a little bit of faith can get you through -- and that you eventually create what you believe.

"Growing up in Mississippi," she says, "one of the greatest gifts I was ever afforded was not to have been put in a segregated school system. Had I been put in a segregated school, and taught in a segregated school system that said, 'You're less than because you're a woman, and you're less than because you're a colored woman,' I probably wouldn't be here today. I would then have had to overcome that belief."

Watch the video to find out why a tiny mustard seed had significance for Oprah when she was a child -- and why it still does today.

"Oprah's Lifeclass" airs on OWN.