"Nor was it mean delight To watch crude Nature work in untaught minds; To note the laws and progress of belief; Though obstinate on this way, yet on that How willingly we travel, and how far! To have, for instance, brought upon the scene The champion, Jack the Giant-killer: Lo! He dons his coat of darkness; on the stage Walks, and achieves his wonders, from the eye Of living Mortal covert, "as the moon Hid in her vacant interlunar cave." Delusion bold! and how can it be wrought? The garb he wears is black as death, the word "Invisible" flames forth upon his chest."