What died on the cross, once and forever, was the Son, the element of the eternally preexistent Godhead that personified Its immutability.   It was the Son who cried out My God, my God, why have You forsaken me?  This was not a cry of confusion, because the Son, in unthinkable eternity, had agreed to the sacrifice; but rather a cry of allusion to the Spirit-inspired prophesy (Psalm 22) of the Godhead’s reconstitution.  Jesus was raised from the dead to replace the Son at the Father’s right hand.

And that reveals the second thing abandoned by the Ur-Father through the incarnation: His own moral authority.

For the Father judges no one, but has committed all judgment to the Son…(He) has given him authority to execute judgment also, because He is the Son of Man.

That which was represented by the Son in the primordial Godhead – in Yahweh – was not a Son of Man.

The wages of sin is death, was Yahweh’s determination, made actual, inflexible and binding, by the Son.  When Jesus assumed the place of the Son in the Godhead, human sympathy became determinative in divine judgment.

God’s failures in creation were due to His own divine intractability, we may say, to His own perfection, and that perfection’s incompatibility with sin, with disobedience.  Only by sacrificing His own perfection, only by relinquishing His own imperturbable judgment, could He coexist with His creation.

He condescended to our weakness by sacrificing His own nature, and incorporating ours.