“In chapter 13 [of A Preface to Paradise Lost], C.S. Lewis… discussed the tendency, since the time of William Blake and Percy Shelley for critics to regard Satan as the hero of Paradise Lost. Lewis put this idea in its place through an examination of the self-delusion of Satan as one who regarded himself as the injured party, and by reference to Milton's theology. Lewis declared, ‘We know from his prose works that [Milton] believed everything detestable to be, in the long run, also ridiculous; and mere Christianity commits every Christian to believing that “the devil is (in the long run) an ass”.’ Lewis said that we see the same ridiculous trait of the ‘Sense of Injured Merit’ in a variety of familiar situations: the spoiled child, the film star, politicians, and minor poets.”
Harry Lee Poe The Making of C.S. Lewis