In the first volume of his magisterial intellectual history, Michael Horton locates the roots of the contemporary “spiritual but not religious” movement in pre-Socratic antecedents of Platonism. Horton makes the case that the Orphic shaman represented a “divine self” that seeks to break free from physicality and become one with a panentheistic unity. Belief in divinity hiding in nature arose as an alternative to monotheism periodically throughout Western history. Horton’s sweeping three-volume set will be the authoritative work students and scholars consult to understand the “spiritual but not religious” tendency as a recurring theme in Western culture from antiquity to the present.