From: Desiring God
What Is the Gospel?
The gospel is the good news that Jesus Christ, the Son of God, died for our sins and rose again, eternally triumphant over his enemies, so that there is now no condemnation for those who believe, but only everlasting joy. That’s the gospel.
The Greatest Good of the Gospel
The greatest good of the gospel is not forgiveness, justification, or eternal life — as good as these are. The highest, fullest, deepest, sweetest good of the gospel is God himself, enjoyed by his redeemed people. The gospel is the good news that God bought for us the everlasting enjoyment of God.
The Invitation of the Gospel
The best news in the world is that there is no conflict between our greatest possible happiness and God’s perfect holiness. Being satisfied with all that God is for us in Jesus magnifies him as the greatest treasure and brings us more joy — eternal, infinite joy — than any other delight ever could.
Justifying faith does not produce perfection in this age, but it always produces a new direction in this age. It dethrones sin, enthrones God, and makes war on sin in our own hearts and bodies.
Brittany Mays 
Terry Littlepage