The Heart of Centering Prayer: Nondual Christianity in theory and practice. Cynthia Bourgeault cuts through the misconceptions to show that Centering Prayer is in fact a pioneering development within the Christian contemplative tradition. This book offers a practical, complete course in the practice and goes deeper to analyze what actually happens in Centering Prayer: the mind effectively switches to a new operating system that makes open-hearted, nondual perception possible. Cynthia then takes readers on a journey through the classic, anonymous text, The Cloud of Unknowing, revealing it to be among the earliest Christian explorations of nondual consciousness.