What is the theme in Out on a Limb by Shirley MacLaine?

Sprituality and self discovery is at the heart of this book. MacLaine, spirituality means the New Age, a new way of looking at one's soul. Shirley thinks of spirituality as something that is often mocked and a state of being in which a person deludes themselves into believing things that can neither be real or proven. However, Shirley's understanding of spirituality changes.