The Good (n.) is Plato's motor: a power beyond being, neither Form nor matter, that casts the sensible world as a bonfire casts carved figures on a wall for the crowd's amusement.
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The Good (n.) is, for Plato, the one true subject, and all human knowing is a climb back up toward it by reflection.
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The Good (n.) is the origin of the visible, and its absolute invisibility is what sight is built on.
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Good (n.) in Plato's Republic wears the features of the father and of capital: it gives offspring, and it gives interest.
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Good (n.) is not being but beyond it, surpassing it in majesty and power — the essence without essence of sovereignty.