Inflation of consciousness (or 'ego-inflation') is a danger when engaging successfully with an archetype of the unconscious, and integrating its contents. May something like that have occurred when we integrated the spirit archetype, over those centuries of developing human consciousness?
Spirit, the archetype of spirit a pre-existent meaning in the midst of chaotic life, has been morphed, over the course of centuries of human history, from of a separated form of being into an integrated function of human consciousness. But precisely how does Jung think such an “integration” might have worked?
Synchronicities are something that "appears” in an individual person’s life, usually at some particular stage or around some event. Therefore, we can assume that there are certain patterns in people’s lives when archetypes are triggered, resulting in greater likelyhood of experiencing synchronicities.