"Although the eternal Son, as God the Son, obeyed the Father and fulfilled what the Father willed for the Son to do prior to the incarnation, yet it was only the God-man, the human Jesus, who could obey in this way. To obey to the point of death requires the ability to die, and for this, Jesus had to be human. To be placed on a cross required that he be in a human body, and so again, this obedience required that he be fully human. But is this not the very point Paul is making--this eternal Son who was himself in very substance God and was fully equal to God, took on our human nature precisely so that he could undergo suffering, affliction, rejection, crucifixion, and death that he experienced, all because the Father had sent him to fulfill this saving mission? What a Savior is our Lord Jesus Christ. How amazing was his obedience, and how great was his love. May we cherish daily the beauty and agony of this eternal Son, becoming incarnate Son, all for the purpose of suffering death for our salvation (page 26)."
--Bruce Ware, The Man Christ Jesus: Theological Reflections on the Humanity of Christ