Plato's Phaedo and STC's "Christabel"

In Phaedo 80ff, Socrates outlines Plato's theory of Forms, particularly attempting to prove that the eternal Forms are of divine origin. Through analogy with the living body and the dead body, Socrates in dialogue with Cebes forces his interlocutor to admit that the body-soul dualism admits to a qualitative difference between the two, and then Socrates begins to describe the separation of body and soul, such as we would describe as a ghost:

"And, my friend, we must believe that the corporeal is burdensome and heavy and earthly and visible. And such a soul is weighed down by this and is dragged back into the visible world, through fear of the invisible and of the other world, and so, as they say, it flits about the monuments and the tombs, where shadowy shapes of souls have been seen, figures of those souls which were not...
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