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The Graces are three aspects of Aphrodite; she’s the prime goddess related to Apollo—his śakti—and the Graces are her inflection as the moving powers of the energy of the world. Euphrosyne is the Grace representing the joy of the radiance that flows out to the world through the qualities of the nine Muses. Aglaea, whose name means “splendor,” represents the energy returning to the deity. Thalia, whose names means “abundance,” unites the two. This is the process of rendering into the world the radiance of the Apollonian consciousness. The central figure is the great serpent whose tail is Cerberus, the three-headed dog who guards the underworld. Thalia is also the name of the ninth Muse, so she is both below Cerberus’s head and she is also the central Grace above
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Joseph Campbell (Goddesses: Mysteries of the Feminine Divine (The Collected Works of Joseph Campbell))