In order to find the mathematical and physical fundament for the description of the body, the soul, and the whole universe, which is to say a "theory of everything," we think that we require "quantum gravity." That such a theory—in principle—already exists and was derived by Hilbert and elaborated in the author’s previous work, The World Formula: A Late Recognition of David Hilbert’s Stroke of Genius. This book digs deeper and shows not only that quantum gravity is more than just a physical theory—describing physical aspects—but also that, in fact, it covers "it all."