“The union of opposites in the stone is possible only when the adept has become One him/herself.
The unity of the stone is the equivalent of individuation, by which [we are] made one; we would say that the stone is a projection of the unified self.
This formulation is psychologically correct. It does not, however, take sufficient account of the fact that the stone is a transcendent unity.
We must therefore emphasize that though the self can become a symbolic content of consciousness, it is, as a supraordinate totality, necessarily transcendent as well.”
-Carl Jung, “The Alchemical Interpretation of the Fish,” in Aion: Researches into the Phenomenology of the Self