This from the book of Mormon gives me my own belief and understanding of grace:
“Wherefore, my beloved brethren, reconcile yourselves to the will of God, and not to the will of the devil and the flesh; and remember, after ye are reconciled unto God, that it is only in and through the grace of God that ye are saved.” (2 Nephi 10:24)
What Rebecca would interperate as our vending machine, I would interperate as reconciling myself to the will of God.
Our reconciliation to God is a grace, grace isn’t something that comes after our reconciliation. Grace is always there, a gift freely given. We are reconciled by grace, by which we are freed from the law. Why would you accept new laws when you have grace?
Romans 5
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Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ,
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through whom we have gained access [by faith] to this grace in which we stand, and we boast in hope of the glory of God.
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Not only that, but we even boast of our afflictions, knowing that affliction produces endurance,
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and endurance, proven character, and proven character, hope,
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and hope does not disappoint, because the love of God has been poured out into our hearts through the holy Spirit that has been given to us.
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For Christ, while we were still helpless, yet died at the appointed time for the ungodly.
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Indeed, only with difficulty does one die for a just person, though perhaps for a good person one might even find courage to die.
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But God proves his love for us in that while we were still sinners Christ died for us.
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How much more then, since we are now justified by his blood, will we be saved through him from the wrath.
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Indeed, if, while we were enemies, we were reconciled to God through the death of his Son, how much more, once reconciled, will we be saved by his life.
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Not only that, but we also boast of God through our Lord Jesus Christ, through whom we have now received reconciliation.
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Our faith is in Jesus Christ, not in new laws.
And seriously, your Book of Mormon quote is stolen from St. Paul, though twisted into something else.
2 Corinthians 5
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Consequently, from now on we regard no one according to the flesh; even if we once knew Christ according to the flesh, yet now we know him so no longer.
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So whoever is in Christ is a new creation: the old things have passed away; behold, new things have come.
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And all this is from God, who has reconciled us to himself through Christ and given us the ministry of reconciliation,
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namely, God was reconciling the world to himself in Christ, not counting their trespasses against them and entrusting to us the message of reconciliation.
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So we are ambassadors for Christ, as if God were appealing through us. We implore you on behalf of Christ, be reconciled to God.
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For our sake he made him to be sin who did not know sin, so that we might become the righteousness of God in him.
It is Christ who has both reconciled you to God and who saves you. Reconciliation is not something you can do yourself, and certainly not by your own righteousness to a law. (See Romans 5-8)
We are called to follow Christ, forsaking sin and seeking forgiveness when we do sin. Forgiveness is a grace. Being reconciled through Christ is a grace. Grace is not something you generate, and neither is faith. Faith itself is a grace.