The original quote about heaven and hell answered by Campbell:
MOYERS: And heaven, that desired goal of most people, is within us.
CAMPBELL: Heaven and hell are within us, and all the gods are within us... All the gods, all the heavens, all the worlds, are within us. They are magnified dreams, and dreams are manifestations in image form of the energies of the body in conflict with each other....
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and a comment about dreams:
MOYERS: You talk about mythology existing here and now in dreamtime. What is dreamtime?
CAMPBELL: This is the time you get into when you go to sleep and have a dream that talks about permanent conditions within your own psyche as they relate to the temporal conditions of your life right now.