I once caught myself thinking that the images of Christian saints on icons often cause cognitive dissonance (and I think this is the reason why these images impress some): on the one hand, these guys are often depicted full of love, compassion and altruism, and by default it's assumed that this is their constant state and source of strength; on the other, we know from our own experience, or simply feel, that such behavior is the path to self-destruction in the long run: you can't only spend energy as an altruist, you must also get it as an egoist.

In this connection, Jung wonders who is the third in the Trinity. Indeed, the fullness of life (or god, in fact), according to Jung, is expressed not by the Trinity but by Quaternity. The third is the Devil (the cross just includes this fourth substance.) But this truth is only for initiates who lead the flock.