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.
All pictures that's painted with sense and with thought / Are painted by madmen as sure as a groat; / For the greater the fool in the pencil more blest, / And when they are drunk they always paint best.
Thou fair-hair'd angel of the evening, Now, whilst the sun rests on the mountains, light Thy bright torch of love; thy radiant crown Put on, and smile upon our evening bed!