In his lap is a cornucopia, and from it pours, inexhaustibly, the food. This is the Grail, the vessel of inexhaustible vitality. The Grail is that fountain in the center of the universe from which the energies of eternity pour into the world of time.
Campbell identifies the cornucopia held by the antlered Cernunnos with the Holy Grail as a universal symbol of the cosmos’s inexhaustible generative energy pouring into temporal existence.
, Transformations of Myth Through Time, 1990thesis