The Origin of Consciousness in the Breakdown of the Bicameral Mind / Julian Jaynes, p. 318-9.
The attempted reformation of Judaism by Jesus can be construed as a necessarily new religion for conscious men rather than bicameral men. Behavior now must be changed from within the new consciousness rather than from Mosaic laws carving behavior from without. Sin and penance are now within conscious desire and conscious contrition, rather than in the external behaviors of the decalogue and the penances of temple sacrifice and community punishment. The divine kingdom to be regained is psychological not physical. It is metaphorical not literal. It is 'within' not in extenso.
But even the history of Christianity does not and cannot remain true to its originator. The development of the Christian Church returns again and again to this same longing for bicameral absolutes, away from the difficult inner kingdoms of agape to an external hierarchy reaching through a cloud of miracle and infallibility to an archaic authorization in an extended heaven.