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The reason Milton wrote in fetters when he wrote of Angels and God, and at liberty when of Devils and Hell, is because he was a true poet and of the Devil's party without knowing it.

The Marriage of Heaven and Hell "The Voice of the Devil" (note) (1790 - 1793)
The reason Milton wrote in fetters when he wrote of Angels and God, and at liberty when of Devils and Hell, is because he was a true poet and of the Devil's party without knowing it.