Barth on incarnation

“God goes into the far country so that man can be brought into the history of the three persons.. He becomes what He had not previously been. He takes into unity with His divine being a quite different, a creaturely and indeed sinful being. To do this He empties Himself, He humbles Himself. But, as in His action as Creator, so in the incarnation: He does not become man apart from a basis in His own being, in His own inner life. What He does by going into the far country corresponds to the history in which He is eternally God. He does not need to deny, let alone abandon and leave behind and diminish His divinity to do this. He does not need to leave the work of reconciliation in the doubtful hands of a creature. He can enter Himself, seeing He is in Himself not only the One who rules and commands in majesty but also in His own divine being, the One who obeys in humility.”
In short, in going to the far country and being obedient to the Father as the Incarnate Son, the Son “does not change. He simply activates and reveals Himself in the world for what He truly is. He is in and for the world what He is in and for Himself. He is in time what He is in eternity, and He is what He is in time because of what He is in eternity. He is in our lowliness what He is in His majesty, and He can be what He is in our lowliness because His majesty is also lowliness. He is as man, as the man who is obedient in humility, exactly what He is as God. This is the true deity of Jesus Christ, His obedience in humility, in His unity and equality with the One who sent Him and to whom He is eternally obedient.”