  A theory of gravity is deduced from the axioms of the premetric program. The
starting point is the conservation of energy and momenta, and the equivalence
of gravitation and inertia. The latter is what leads to the framework of the so
called purified gravity. The local and linear constitutive relation has 14
components when it is assumed to be metrical, but the compatibility of the
constitutive relation with an action principle fixes uniquely the theory of
Coincident General Relativity. The premetric formalism of purified gravity has
a direct analogy with massive electromagnetism, the Planck mass corresponding
to the Proca mass of the gauge boson. The metric emerges as a Stueckelberg
field, and the graviton as a Goldstone boson of the broken symmetry.
