Consciousness drawn out of the lower nature tends the faculties before the higher call arrives, keeping the flock of its own mental energies under an older, natural wisdom that has cared for the powers through a long season of strife and judgment. That earlier wisdom is enough until something greater stirs.
Leading the flock to the backside of the desert is turning the whole herd of thoughts away from the outer world into the far, hidden inner ground where the lower self is stripped bare. Only there, in that emptied place, does the ascent begin and the mountain of God is reached: the raised, elevated state of awareness where the deeper voice finally speaks.
Moses: consciousness drawn out of the lower nature to lead the faculties upward
Flock: the thoughts and mental energies a person tends and leads
Jethro, priest of Midian: an older, natural wisdom that tends the powers through a season of strife before the higher call
Backside of the desert: the far, hidden inner ground reached by turning from the outer world, where the lower self is stripped away
Mountain of God, Horeb: the raised, elevated state of consciousness where the deeper voice is heard