“How could Jesus triumph over Satan in His death? We can understand this only if we recall that Satan is a parasite. He depends for His power and authority entirely upon the sinfulness of men and women. So long as we are still accounted guilty before the heavenly Judge, Satan has solid legal grounds to accuse us. Once the debt is paid, once the penalty has been administered, Satan’s head is crushed, and he falls from heaven like lightening. He no longer has an airtight case against God’s people; he has no case at all. When the Judge pronounces a ‘not guilty,’ the accuser must fall silent.”
Peter J. Leithhart, The Kingdom and the Power (Phillipsburg, NJ: P & R Publishing, 1993), 39.