The demand to release the captive people is the awakening drawn-out-of-water self confronting the tyrant of the flesh who holds the higher powers in bondage. Pharaoh is the ruling ego seated in the body, the great house of the material self that keeps the finer energies enslaved to labor and appetite, and the people of Israel are those inner faculties meant to rise and prevail with God. Moses, drawn from the water, is the reason lifted out of the flood of the emotions, and Aaron the voice that speaks for it, the 2 working to loose what the body-king has chained.
What unfolds is the summons for the inner powers to leave the brickyards of the flesh and go into the wilderness, the empty desert of the mind stripped of distraction, where alone the true worship can be held. The feast is not for Egypt but for the barren, silent place where the self meets its own source.
Pharaoh: the ruling ego in the body, the tyrant self that keeps the finer energies enslaved to appetite
Moses: the reasoning power drawn up out of the flood of the emotions
Aaron: the speaking voice that carries the higher command to the flesh
Israel: the inner faculties meant to rise and prevail with the divine
Wilderness: the emptied, silent desert of the mind where true worship is held