Divine Impassibility and the Passion of the Christ

I have been reading with profit an article by Kevin DeYoung in the Spring 2006 issue of Westminster Theological Journal entitled "Divine Impassibility and the Passion of Christ in the Book of Hebrews."  DeYoung seeks to refute the argument that the sufferings of Jesus show the true suffering nature of God himself.  In trying to show that the passibility of God cannot be assumed from the passibility of Christ, DeYoung has four main lines of argument, all of them persuasive.