The Gospel is a doctrine that teaches what a person should believe, so that he receives forgiveness of sins with God. In other words, it teaches that God's Son, our Lord Christ, has taken upon Himself and borne the Law's curse and paid for all our sins. Through Him alone we again enter into favor with God, receive forgiveness of sins through faith and are delivered from death and all the punishments of sins, and are eternally saved.
Everything that comforts, that offers God's favor and grace to transgressors of the Law is called, the Gospel. It is a good and joyful message that God will not punish sins, but will forgive them for Christ's sake.
Every penitent sinner ought to believe (i.e., place his confidence) in the Lord Christ alone. Christ "was delivered up for our trespasses and raised for our justification" (Rom. 4:25). "He made Him to be sin who knew no sin, so that in Him we might become the righteousness of God" (2 Cor. 5:21), "whom God made our wisdom, righteousness, sanctification and redemption" (1 Cor. 1:30). His obedience is credited to us for righteousness before God's strict court. The Gospel "is the power of God for salvation to everyone who believes" (Rom. 1:16). Dr. Luther taught that the knowledge of God from the Gospel is far different from that which is learned from the Law. (paragraphs 20-22)
Condensed from CONCORDIA: THE LUTHERAN CONFESSIONS, copyright 2005,2006 by Concordia Publishing House. Used by permission. All rights reserved. To purchase a copy of CONCORDIA, call 800-325-3040.
Lord grant you faith in His grace alone for your salvation unto eternal life. Amen