World-renowned religious scholar Karen Armstrong spent seven years in a Roman Catholic convent searching for God. It wasn't until after she left that she found him. Watch as she reflects on her spiritual journey, and find out why she says the biblical God is only a 'starter kit' to faith.

In this Breathing Space, we take inspiration from the title of Karen Armstrong's book 'The Spiral Staircase,' a memoir about her spiritual journey. Take a moment to appreciate the beauty of spirals that occur in nature.

Oprah sits down with Karen Armstrong, a former Roman Catholic nun and a world-renowned religious scholar, to discuss her memoir 'The Spiral Staircase.' Karen reveals deep personal struggles that ultimately became steppingstones in her spiritual journey. Watch on demand.

When she was 17 years old, Karen Armstrong was in search of God. To that end, she entered a Roman Catholic convent and became a nun. When she started her new life, she faced a number of struggles, including the fact that she couldn't pray. Watch as Karen reflects on feeling like a failure in the convent.

At 17, Karen Armstrong, who later in life would become a world-renowned religious scholar, entered a Roman Catholic convent. From the start, Karen had trouble adjusting to the lifestyle. Still, there was one sister who never saw her as a problem. Watch as Karen reflects on what this nun said to her all those years ago and why kind words carry so much power.

Former Roman Catholic nun and best-selling religious historian Karen Armstrong, who created TED's Charter for Compassion, shares how she found her faith after losing her way.

Past-life regression expert Dr. Brian Weiss says the people who have loved you on this earth are called master teachers, who can be viewed as angels after they pass. Watch as he and Oprah discuss the many forms of angels and why Oprah says she feels more connected to her late dog Sophie now than she ever did before.

In this round of Soul to Soul, past-life regression expert Dr. Brian Weiss opens up about what he believes the soul is, what happens when we die and more.

Back in 1980, Dr. Brian Weiss was using hypnotherapy with a patient named Catherine to discover the roots of her paralyzing phobias. During one of their sessions, Dr. Weiss asked Catherine to go back to the time those phobias started. Instead of going back to childhood, she went back 4,000 years in time to a past life. At first, Dr. Weiss, an Ivy League-trained psychiatrist, thought what she was saying was unbelievable. Then, Catherine said something that turned Dr. Weiss from skeptic to believer. Find out what it was.

Dr. Brian Weiss says past-life regression can help heal the mind, body and soul. So when his daughter, Amy, was diagnosed with sight-threatening cataracts at age 25, she decided to give it a try. Find out what she saw during her past-life regression, and learn how she's doing today.