A Theory of Everything: An Integral Vision for Business, Politics, Science, and Spirituality is a 2000 book by Ken Wilber detailing the author's approach, called Integral theory, to building a conceptual model of the World that encompasses both its physical and spiritual dimensions.

He posits a unified ground-of-everything he calls Spirit.

The book's first four chapters cover the physical and mental development of this unified ground.

[1] Beliefnet.com says that this book is, "Wilber's shortest, simplest overview of his work.

"[2] This article related to a book about religion is a stub.