The gospel is the heart of the Christian faith. It is the good news of what Christ accomplished for us through his death and resurrection. Out of his immeasurable love, Jesus willingly gave his life to rescue us from our sins and open the door to a relationship with him. We are saved by trusting Christ as our Savior and Lord of our lives. Our salvation is a gift of God's grace; we are not saved by our efforts to impress God or prove how morally deserving we are of his love. Jesus already definitively proved his love for us on the cross. Our lives of faith, including obedience to God's commands, are a joyful response to what he already did for us. The gospel, therefore, is our primary lens of faith.
The Apostle Paul said it this way in Galatians 2:20: I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God, who loved me and gave himself for me.