An excerpt from Carl Trueman:
. . . At the heart of this new theology was the notion that God reveals himself under his opposite; or, to express this another way, God achieves his intended purposes by doing the exact opposite of that which humans might expect. The supreme example of this is the cross itself: God triumphs over sin and evil by allowing sin and evil to triumph (apparently) over him. His real strength is demonstrated through apparent weakness. This was the way a theologian of the cross thought about God. . .
Read the whole thing here.