The posts of Emperor and Pope are realities beyond as well as on this side of the threshold which separates ‘day’ and ‘night’. And the Pope of the fifth card is the guardian of this threshold. He is seated between the two pillars – the pillar of day or prayer and the pillar of night or benediction.
The Emperor of the fourth card is the master of the day and the guardian of the blood or quintessence of the nocturnal reality of the day. The Pope is the guardian of respiration or of the reality of the relationship between day and night. That which he guards is the equilibrium between day and night, between human effort and divine grace. His post is founded on primordial cosmic deeds. Thus the first book of Moses says:
….and God separated the light from the darkness. God called the light Day, and the darkness he called Night. (Genesis i, 4 – 5).
And the act of separation of the intelligible from the mysterious signifies at the same time the establishing of cosmic respiration, which is the analogy of ‘the Spirit of God moving above the face of the waters.’ For the divine breath (ruach ‘elohim) above the profoundness of peace (‘the waters’ – it is this which is the psychological as well as th e cosmic reality of nirvana) is the divine prototype of respiration.
Unknown Author, Meditations on the Tarot, Letter V, The Pope