From Following Jesus by N.T. Wright

“The cross and the resurrection thus establish the kingdom of the Son of Man. That is, they achieve the purpose for which God called Abraham in the first place, the purpose for which God called David to be the man after his own heart, the purpose which seemed to be thwarted by the exile but which was actually thereby designed to come to its great climax…The powers, the great monsters, seemed to be winning the victory; but the cross and resurrection show that all authority has now been committed to Jesus.”