Speaking of "the great matters"...
The Gospel...is that doctrine which teaches what a man should believe in order to obtain the forgiveness of sins from God, since man has failed to keep the law of God and has transgressed it, his corrupted nature, thoughts, words, and deeds war against the law, and he is therefore subject to the wrath of God, to death, to temporal miseries, and to the punishment of hell-fire. The content of the Gospel is this, that the Son of God, Christ our Lord, himself assumed and bore the curse of the law and expiated and paid for all our sins, that through him alone we reenter the good graces of God, obtain forgiveness of sins through faith, are freed from death and all the punishments of sin, and are saved eternally.
The Formula of Concord, Solid Declaration, V:20
Nails it, eh?