David E. Fitch said this quote

“ The gospel is the announcement that God has fulfilled the promise of Scriptures to make the world right in Jesus Christ (1 Cor 15:1-11). Christ has died for our sins. By his death and resurrection (and ascension), he has defeated the effects of our sins, including death itself. He now sits at the right hand of the Father ruling over the world. In Christ the new creation has begun. Old things are passing away. Behold, the new has begun (2 Cor 5:17). All who respond to this good news repent of the old ways, and make Jesus their Lord and Savior, enter in and become part of what God is doing to reconcile the whole world to himself (2 Cor 5:18-19), and receive power to become the children of God (Jn 1:12). This in one paragraph is the gospel. ”