Neurosurgeon Dr. Eben Alexander was strictly a man of science, a skeptic of the existence of a soul or God, until a near-death experience changed his entire perspective on life and faith. In his best-selling book, Proof of Heaven, Dr. Alexander opens up about the rare form of meningitis that shut down part of his brain—and how he says he experienced heaven against all medical odds.

Now, Dr. Alexander is talking to Oprah. Their conversation, which Oprah says lasted for two hours, will air in a one-hour "Super Soul Sunday" on January 20. "I just talked to a man who saw God," Oprah says. "He talks about how that experience of heaven has now changed the way he lives here on earth and how it can change the way we all live."

Oprah says Dr. Alexander agrees with a belief she's always had: that newborns and young children are still attuned to a spiritual realm. Watch the video above for Oprah's thoughts and to see part of that discussion.