What is the theme in Merlin Enthralled by Richard Wilbur?

Morality is at the heart of this poem. This poem deals with the death of Merlin, the legendary sorcerer from the court of King Arthur. Because Merlin was known for his magical powers, it is a bit of a surprise that he could die at all. More surprising than that is the fact that he dies willingly, accepting death as a release from his responsibilities.