The passage discusses salvation through faith in Jesus Christ alone. It states that all have sinned and fallen short of God's glory, but can be justified freely by God's grace through the redemption accomplished by Jesus on the cross. God presented Jesus as a sacrifice to declare his righteousness, so that he can forgive sins and still be just by justifying all who believe in Jesus. Therefore, no one can boast about their own works, but only have faith in God's gift of salvation.