The Gospel (or, the good news) is the very centerpiece of Christian theology - pointing to salvation by grace (unearned) through faith (belief!) in Jesus and what Jesus did on the cross. Our faith doesn't save us, nor do works save us, but the work of Jesus saves us...so there is never a reason to boast, nor is there a reason to fear that we aren't good enough for eternal life in Heaven, because it is not our goodness that saves us, but the perfect goodness of Jesus.
