Against the nominalist's conception of God's metaphysical essence being the sum of all his perfections.
Nominalists hold that God’s metaphysical essence is in the sum of all his perfections. The problem with this nominalist conception is that the sum of all his perfections does not only consist of the metaphysical but also the physical. This is so because “the Word became flesh” (John 1:14). Now, Jesus is perfect in all of his being, even his human side, one of the reasons being that he had all “but sin” (CCC 467). Therefore, the physical nature of Jesus is also what constitutes God being perfect.