What's a "Quisling?" you ask.
Well, the term itself comes from Norway, during World War II.
Quisling, Vidkun (1887-1945), Norwegian politician, whose collaboration with the Nazis...during World War II (1939-1945) made his name synonymous with traitor. In the 1930s he found the National Union, a Fascist party that received subsidies from Germany. After the Nazi invasion of Norway in 1940 the National Union was declared the only legal party. The Germans installed Quisling as prime minister in 1942 and throughout the war he collaborated with the Nazis. Quisling was tried and executed after the war.
Quisling was Norway's version of Benedict Arnold. He was a traitor. Other synonyms (just so you can get the full affect here, for purposes that will be revealed in just a moment): apostate, backstabber, betrayer, double-crosser, double-dealer, Judas, traitor, recreant, serpent,snake, turncoat.
All this started my mind thinking when I read these verses from John 14: “I will no longer talk much with you, for the ruler of this world is coming. He has no claim on me, but I do as the Father has commanded me, so that the world may know that I love the Father. Rise, let us go from here.” (John 14:30–31 ESV) Make sure you read that well: "He has no claim on me…."
Now, initially, you may think, that's because Jesus is the Son of God. How could Satan have a claim upon him? But don't be hasty, as Treebeard would say. Think back to Jesus' earliest days after his baptism. He went out into the wilderness to be tempted by the devil. Satan was seeking to establish a claim upon Jesus then. And he did so frequently, just not in as much a frontal assault as in Matthew 4. How did Jesus avoid this? Well, during the temptations in the wilderness, he used the Word of God. How will he manage it during his betrayal, trial, suffering and death? Same way: "…I do as the Father has commanded me…"
Sadly, you and I are not like Jesus. We have our own internal Quislings, accusing us, turning traitor on us and giving Satan some ground. This is called indwelling sin. A D-Day victory (yes, I continue with the WWII analogies) was won at the Cross. V-Day wouldn't come till some months later. Until then, the Allied troops still had battles to fight. And so do we. Satan was dealt a fatal blow when Christ died upon the cross. Sin's power was broken for all who believe. At that moment, when our hearts are made new, we switched masters. We became bond-servants (slaves) of Jesus Christ.
But there are still battles to fight and victories to be won. Romans 8.13 says, “For if you live according to the flesh you will die, but if by the Spirit you put to death the deeds of the body, you will live.” The old KJV uses the word "mortify" which means "put to death." That's what we have to do––execute the traitor within us. We must kill the Quisling or Satan will have continual ground to keep coming at us, in order to steal our joy in Christ Jesus. The world will spot the inconsistency within us and seek to assail us from without.
So, get rid of your Quisling. Repent and believe!