By living a virtuous, religious life, he develops a double in the Beyond, and the moment of death is the moment of reunion with the other half.
Von Franz locates the Doppelgänger within Persian-Gnostic myth as the transcendental complementary self — the soul’s other half held in reserve beyond incarnation — whose reunion at death consummates the divided human being.
, The Problem of the Puer Aeternus, 1970thesis