In the long stillness of meditation the lower self rebels against the very discipline that is freeing it. Drawn up out of the lower mind and its rule of the senses, a person reaches the dry patience of the inward wilderness and there the carnal voice complains against the mind that led it and against the higher power behind that mind. It craves the coarse food of the senses and turns in disgust from the fine bread, the subtle wisdom and brain-sugar that feed the higher self, and from the water of truth. What is happening is simple: the appetites, hauled out of their old comfort into the demanding quiet, resent the light nourishment of the spirit and howl for the heavy meals of the flesh.
Egypt: the lower mind, the self ruled by the senses, the old bondage a person is drawn up out of
Wilderness: the dry, patient ground of meditation where the lower self is tested
Bread: the fine, subtle food of wisdom, the brain-sugar that feeds the higher mind
Water: truth, the living nourishment the carnal self loathes
Moses: the picture of a person's own mind, the inner leader guiding the ascent