The Screwtape Letters

Why might Lewis have Screwtape and Wormwood refer to the young man as the “patient”? How does this word choice contribute to the work’s overall meaning?

The Screwtape Letters is satire, but Screwtape himself does not generally approve of humor. What does this disconnect reveal about Lewis’s conception of God?

What does Screwtape mean when he calls humans “amphibious”? How does humanity’s dual nature compare to Screwtape’s own changeability (e.g., into a centipede)?