GOSPEL OF INTEGRITY:
You were saved by grace; now you need to live accordingly because you wouldn't want to risk losing your salvation. Go to church on Sunday, read the Bible every day, stop smoking, stop swearing, don't sleep around, don't get a divorce and be sure to evangelise your friends. All these things will make you look like a good churchy-Christian, and no one will question your salvation.

GOSPEL OF GRACE:
Jesus did it; now believe it! You'll live accordingly - gradually - as God works in you to naturally produce fruit, BUT DON'T TRY. The more you try to follow the law, the more you WILL FAIL. Let Jesus do it for you and in you. Your only role is to believe and therefore receive - and if you feel like you can't believe, ask Jesus to believe for you and in you, because even BELIEF IS NOT A WORK!