Centering Prayer is the path to a wonderful and radical new way of seeing the world. It is not, as is sometimes thought, simply an act of devotional piety, nor is it a Christianized form of other meditation methods. Cynthia Bourgeault here cuts through the misconceptions to show that Centering Prayer is in fact a pioneering development within the Christian contemplative tradition. She provides a practical, complete course in the practice and then goes deeper to analyze what actually happens in Centering Prayer: the mind effectively switches to a new operating system that makes possible the perception of nonduality. With this understanding in place, she then takes us on a journey through one of the sources of the practice, the Christian contemplative classic The Cloud of Unknowing, revealing it to be among the earliest Christian explorations of the phenomenology of consciousness. Cynthia Bourgeault's illumination of the Centering Prayer path provides compelling evidence of how important the practice has become in the half-century since it first arose among American Trappist monks, and of its maturation and refinement over the ensuing years of sincere study and practice. It will resonate with beginners on the Centering Prayer path as well as with seasoned practitioners.