  A possible alternative route to a quantum theory of gravity is presented. The
usual path is to quantize the gravitational field in order to introduce the
statistical structure characteristic of quantum mechanics. The procedure
followed here instead is to remove the statistical element of quantum theory by
introducing final boundary conditions as well as initial. The relevant quantum
formalism then becomes compatible with the non-statistical nature of general
relativity and a viable theory can be constructed without difficulty. This
approach also provides a simple method of avoiding the configuration space
description of quantum mechanics and allows the formulation to be carried out
entirely within the four dimensions of spacetime. These advantages are made
possible by the inherent retrocausal nature of the final boundary conditions.
