The Greatest Source of Energy describes a new method for combining the two most powerful theories in science-General Relativity and Quantum Mechanics-into what is known as the Theory of Everything. The foundation of the method is a new model of time-called Temporal Energy Theory-that unites the view of time as a relative phenomenon with the view of time as an absolute and universal phenomenon. If Temporal Energy Theory is proven to be correct, it will have redeemed Newton's idea of a universal background clock, without taking anything away from Einstein's idea that time is relative. The benefits of successfully combining General Relativity and Quantum Mechanics are endless, but a way to make this connection has been elusive for many years. The Greatest Source of Energy breaks new ground in the intense work on unification and may put us on a path to a better understanding of the universe.