What is the heart of the gospel

"The heart of the gospel is not getting sinners to pray a pray so that they won't go to hell when they die. The heart of the gospel is the glory of God! The heart of the gospel is a God who is jealous for his own glory so he sends His Son to redeem us for He won't give His glory to another! The gospel is about a Son who is so jealous for His glory that He prays to His Father in John 17, "Father, I want those whom you have given me to be with me where I am so that they can behold my glory, the glory I had before I came to earth. The glory of God is what moved God to choose a people. The glory of God is the heart of the gospel!"