Each dead person, according to Egyptian belief, becomes the god Osiris, the hidden god of the underworld, not in some invisible way or in the way of an analogy, but through the actual concrete operations of the mummification of the corpse.
Von Franz argues that Egyptian ritual practice enacted a literal identity of material substance and the divine, making mummification the paradigmatic instance of psyche-matter unity and the template for alchemical transformation.
, Psyche and Matter, 2014thesis