It must be remember that in Mark's mind hardly one rag of noble thought, either Christian or Pagan, had a secure lodging. His education had been neither scientific nor classical - merely "Modern." The severities both of abstraction and of high human tradition had passed him by: and he had neither peasant shrewdness nor aristocratic honour to help him. He was a man of straw, a glib examinee in subjects that require no exact knowledge.
"It is idle to point out to the perverted man the horror of his perversion: while the fierce fit is on, that horror is the very spice of his craving. It is ugliness itself that has become, in the end, the goal of his lechery; beauty has long since grown too weak a stimulant."