Hebrews 2:14-16 (ESV)
Since therefore the children share in flesh and blood, he himself likewise partook of the same things, that through death he might destroy the one who has the power of death, that is, the devil,  and deliver all those who through fear of death were subject to lifelong slavery.  For surely it is not angels that he helps, but he helps the offspring of Abraham.
Why did Jesus die? There are very easy and simple answers to that question and there are varied ways to put it. The author of this letter to Hebrew Christians answers it here in 2:14 & 15. 1) He died to destroy the one who has the power of death, the devil. Death is so final, so irreparable. We can fight disease and tragedy and accidents. We do much to help people avoid an encounter with the undefeatable foe – death. But death is not ours to defeat. All that we do is slow down the process, postpone the inevitable.
This verse tells us that death belongs in the hands of the author of evil. This is a frightening prospect. The thing we fear the most is in the hands of the one who hates us most. How would you like it if the person who hates you most had the power to end your life? He does. What you need is someone who is more powerful who loves you and will defeat the one who has the power of your death in his hands and rescue you.
How did Jesus defeat death and take it out of the hands of the devil? He succumbed to it. He died and then, without the help of anyone, rose from the dead. Result? Satan is defeated. Satan is now a defeated foe. He is the biggest fool in history. The thing he thought would garner him ultimate victory, the death of the Son of God, actually secured his ultimate and decisive defeat. When Jesus said “I saw Satan fall…”(Luke 10:18, John 12:31) He was referring to what was about to happen through His impending death. Jesus died and Satan fell.
The world serves a fool and a loser. We should never look at it with envy or longing. And we should do all that we can to rescue them from him. Jesus Christ is the only One who can snatch from Satan, those in his grasp. What we do is give the Gospel which is the power of God. Jesus has defeated Satan through His death and resurrection. How those in Satan’s grip need to hear the Truth of the Gospel and be liberated.
Christian, if you are truly thankful for the liberating power of the Gospel, then live a transformed life and give the powerful Gospel to all whom the Lord puts in your path who will listen to it. It will fill your heart with great joy.