Are We There Yet?

here the analogy

..Yes, the confrontation and interpenetration of good and evil in the universe, and pain and pleasure, light and darkness, heat and cold, beauty and ugliness, and guidance and misguidance are for a vast instance of wisdom. For if there were no evil, good would not be known. If there were no pain, pleasure would not be understood. Light without darkness would lack all importance. The degrees of heat are realized through cold. Through ugliness, a single instance of beauty becomes a thousand in-stances, and thousands of varying degrees of beauty come into existence. If there were no Hell, many of the pleasures of Paradise would remain concealed. By analogy with these, in one respect everything may be known through its opposite and a single truth produce numerous shoots and become numerous
truths. Since these intermingled beings pour from this transitory realm into the eternal realm, surely just as things like good, pleasure, light, beauty, and belief are poured into Paradise; so harmful matters like evil, pain, darkness, ugliness, and disbelief flow into Hell, and the floods of this continuously agitated universe are emptied into those two pools.

The Staff of Moses / Eight Topic (page 51)