This little quotation from a commentary on Ephesians gave me the way in to last Sunday's sermon:

“The whole armour of God who won his pacific victory over the powers through the cross [...] is nothing less than the naked, defencelessness of the crucified Christ”

John Muddiman The Epistle to the Ephesians London,. Continuum, 2001 page 283

Go ponder, it's worth it!