"For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. For in it the righteousness of God is revealed from faith for faith, as it is written, 'The righteous shall live by faith.'"
Romans 1:16-17
Gospel. n. (god, good + spel, news) the good news of salvation for hell-deserving sinners through the Person and work of Jesus Christ.
(Definition from "A Gospel Primer for Christians" by Milton Vincent)