For Milton, the Son is the manifestation of God in action. While God the Father stays in the realm of Heaven, the Son performs the difficult tasks of banishing Satan and his rebel angels, creating the universe and humankind, and punishing Satan, Adam and Eve with justice and mercy. The Son physically connects God the Father with his creation. Together they form a complete and perfect God.
The Son personifies love and compassion. After the fall, he pities Adam and Eve and gives them clothing to help diminish their shame. His decision to volunteer to die for humankind shows his dedication and selflessness. The final vision that Adam sees in Book XII is of the Son’s (or Jesus’) sacrifice on the cross—through this vision, the Son is able to calm Adam’s worries for humankind and give Adam and Eve restored hope as they venture out of Paradise.