In John, Jesus is going to His death on the Cross. It is by His death that the Judgement and condemnation to Satan is to come about. Jesus will also be going back to all those who have died "under the law of sin and death" and offer them salvation by grace. Satan is losing his" possession of the world" AS the kingdom of God, the New Covenant, is being brought in by the shedding of His blood. Forgiveness for sin, no longer death for sin, and also to whomsoever would, is but a couple of hours away at that point. These are the ways the prince of this world is being cast out. Because it is Satan, and those who claim to be Jews but are not, but are of the synagogue of Satan, that have brought it all about. Satan has set in motion his own death sentence. He has shed the innocent blood of the Lord. He is being dethroned.what about this
Joh 12:31 Now is the judgment of this world: now shall the prince of this world be cast out.
Luk 10:18 And he said unto them, I beheld Satan as lightning fall from heaven.
no more accusing.
In Luke Jesus is talking about a future event, when Satan will be cast out of heaven at the end of the war in heaven where his place will no more be found and he is cast to the earth, to set about deceiving as many people as he can, with all his supernatural powers, proclaiming himself to be God and sitting where he ought naught. Satan will be here as the false morning star, with a fabric bow, deceiving the whole world if possible. Jesus is telling us He is leaving us power over our enemies, that they will be subject to that power and isn't this a great example of why you should know all the promises of God. But as helpful as that is all going to be, Happiness is to be found by finding your name in the book of life.