If God is not able to be changed or have anything given to him (per St. Thomas Aquinas’ Summa Theogica), how can Jesus assume human nature? Wouldn’t that imply that there was something he didn’t have (human nature) that he got…therefore, wouldn’t He have changed through the Incarnation?
When Jesus took on a human nature, nothing in His divine nature changed. The taking on of a human nature was external to His divine nature. His human nature underwent much change, but not His divine nature.
Fr. Vincent Serpa, O.P.