The term comes from Narcissus the hunter in Greek mythology. His enemy, Nemesis noticed how proud and self-absorbed he was and used this to kill him. Nemesis attracted Narcissus to a pool, where he saw his own reflection in the water and fell in love with it, not realizing it was merely an image. Unable to leave the beauty of his reflection, Narcissus drowned.
We are becoming a society of far too many narcissists---people who endlessly post "selfies" and are incapable of a deep unselfish relationship, ministers who promote themselves more than the gospel, and the battle cry is "What's in it for me?!" "What about me?" "Poor me" and "I'm going to get mine..."
This is diametrically opposed to the Gospel of the Kingdom that Jesus preached:
Then He said to them all, “If anyone desires to come after Me, let him deny himself, and take up his cross daily, and follow Me. Luke 9:23
And those who are Christ’s have crucified the flesh with its passions and desires. Galatians 5:24
For whoever desires to save his life will lose it, but whoever loses his life for My sake and the gospel’s will save it. Mark 8:35
And he who does not take his cross and follow after Me is not worthy of Me. Matthew 10:38
Romans 6:1-23 (Dead to sin, alive to God)
Those are just a few of the many scriptures about dying to self. Seek them out, do a search on the internet. Then read them and get them down in your spirit. Use those scriptures to drive out any "Me gospel" that is trying to take root in you. Also, sharpen your discernment gift as you choose your relationships and ministries/pastors you may seek out for spiritual growth and knowledge. In all of those situations, ask yourself what comes out of their mouth. What do they always talk about? What do they post on their social media accounts? What is their true focus? If they spend time in the Word, the Word will be in them and THAT is what will flow out of their mouth. Their actions will line up with God's Word. Don't make excuses for their behavior.
Let your discernment show you the people who should be in your life and the leaders you can learn from. Run from those who, in action and deed, are spreading the gospel of Me.
Let us always strive to be selfless not selfish....that is being Jesus to the world.