Born in 1945 in Deer Lodge, Montana, former NBA coach Phil Jackson grew up in a strict religious home. His parents were both Pentecostal ministers and the family spent almost all their free time at church. At one point, Phil's father and mother wanted him and his siblings to start speaking in tongues. Watch as Phil reflects on that time.

Tune in Sunday, June 16, for Oprah's complete interview with Phil Jackson. Watch on OWN or join our worldwide simulcast on Oprah.com, Facebook.com/owntv or Facebook.com/supersoulsunday.

Former NBA coach Phil Jackson says building a basketball team is like building a circle of love—not romantic love or even brotherly love. It's the same connection that bonds warriors in battle, he says. Read the entire first chapter of Phil's new book, Eleven Rings: The Soul of Success, to find out why and learn more about the five stages of tribal development Phil believes in. Then, tune in or log on Sunday at 11 a.m. ET/PT to watch Oprah's complete conversation with Phil on "Super Soul Sunday."

So many of us are terrified of what will happen if we don't have all the answers. Find out how to surrender to faith—and happiness—from the author of The Spiral Staircase. Then, tune in for Oprah's complete conversation with Karen Sunday at 11 a.m. ET/PT on OWN and online.

I never intended to be a historian of religion or a freelance writer. I dreamed of being a university professor and spending my life teaching English literature. And for about 13 years, the very thought of religion filled me with weariness and a sense of failure. I had entered a convent when I was 17 years old and struggled in vain for seven years to become a good nun. For one thing, I was completely unable to pray. Every morning I would go into the chapel to make my meditate, and struggled with boredom, sleepiness and endless distractions. The heavens remained closed and God seemed distant and unreal. I also began to have grave doubts about some of the doctrines of the Church. How could anybody possibly know for certain that the man Jesus had been God incarnate and what did such a belief mean? Had God really created the world? Or had human beings created God? Eventually, with regret, I left my convent and, once freed of this burden of depression, doubt and inadequacy, I felt my belief in God slip quietly away.

I do not think my experience is unusual. Most of us first hear about God at about the same time as we are told about Santa Claus. Over the years, our ideas of Santa change, mature and develop, yet our idea of God can get stuck at an infantile level. We are not encouraged to develop it in the same way. But everything changed for me when I sat down to write a book called A History of God. I had expected it to follow the same line as my previous, somewhat skeptical books: I thought I would show how the concept of God had been constantly rejigged by theologians to answer current perplexities and needs. But this time, my circumstances were different. I had just suffered a major career disaster: my television career had folded in ignominy, I was very hard up; my friends had all disappeared, and I was living in a remote (cheap) part of London. All day and every day, I was alone—and in silence. Theology is poetry, and you cannot read a complex poem in a noisy nightclub; you need to have a quiet, receptive mind. Further, there was now no television crew to urge me on to be clever and provocative. There was just me and the text, and gradually, the words began to take on a new significance.

I suddenly found that I was learning a great deal from other religious traditions. From Judaism, I learned to never stop asking questions—about anything!—and never to imagine that I had come to the end of what I could know and say about God. Jews even refuse to speak God’s name, as a reminder that any human expression of the divine is so limited that it is potentially blasphemous. From the Eastern and the Russian Orthodox Christians, I learned that Jesus was the first human being to be totally possessed by God—just as Buddha was the first enlightened human being in our historical era—and that we can all be like him, even in this life. From the Quran, I learned that all religious traditions that teach justice, compassion and respect for all others have come from God. And I was enthralled to find this quotation from the great 13th-century Sufi philosopher Ibn Arabi:

Do not praise your own faith so exclusively that you disbelieve all the rest; if you do this you will miss much good. Nay, you will fail to realise the real truth of the matter. God the omnipresent and omniscient cannot be confined to any one creed, for he says in the Quran: "Wheresover ye turn, there is the face of Allah."

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When she was 17 years old, British religion author Karen Armstrong went into a convent to find God. Seven years later, she left still searching. Watch as she opens up about her experience and find out why she believes the Biblical God is merely a "starter kit".

Tune in Sunday, June 9, at 11 a.m. ET/PT for Oprah's complete conversation with Karen Armstrong. Watch on OWN or join our worldwide simulcast at Oprah.com, Facebook.com/owntv or Facebook.com/supersoulsunday.