We believe that we are justified by grace through faith in our Lord Jesus Christ and that he that believeth hath the witness in himself.
If I cannot save myself, and God has to do it, then I am glad that doctrine 6 says God has done that for everyone through Jesus. I am also glad that doctrine 7 gives me confidence that it is not hard to be saved, God wants me in relationship with him. But the really cool bit comes in doctrine 8.
Stop trying! Stop striving! Being in relationship with God means you don’t have to pretend. It is not about being painfully good, it is about being authentic. ‘fess up! You cannot do it by yourself. Only God’s grace gives you any hope at all, and you can’t earn grace.
This doctrine says God did all the work, and if you believe that you know it. No-one else then, can comment on your salvation or lack of it. You know, who and what you believe. You know what God has said to you and there is no external “thing” that makes you justified. Not a uniform, not baptism, not communion, not playing in a band, not even being General. No, it is God who makes things right, and lines you up with his purpose. Who does he do that for? Every one who turns around and faces him.