In the last year or so I've become acquainted with the writings of Pastor and Seminary Professor, John Jeske (he is the father of Pastor Mark Jeske of the "Time of Grace" television program). Here is another gem from John Jeske's book, "Connecting Sinai to Calvary."
Because in our place our Substitute lived a life of perfect obedience to the holy law of God, God considers us to be people who have given Him the perfect obedience He demands. Because in our place our Substitute died innocently under God's curse, God considers us to have been punished for our sin. (page 67)