[Dumbledore]

Here is another extract from the lecture on Calvin's view of justification that really gets to the differences in the 16th. century

There are two main effects of justification. First, Calvin said, "Justification serves God's honor. This enables us to honor God in the way we think and live so that His glory stands undiminished." Calvin also said in Book III, chapter 13, section 2, "Man cannot, without sacrilege, claim for himself even a crumb of righteousness, for just so much is plucked and taken away from the glory of God's righteousness." In other words, when you talk about salvation, if you take even a little bit away, just a crumb of righteousness that you claim for yourself, then you diminish by that much the glory of God's righteousness. When I think about the Roman Catholic medieval system, I usually call it "percentage theology." Catholic theologians differed on exactly how it worked, but the system meant that God does His part and you do your part. So, for instance, God might do 90% while you do 10%. That is percentage theology. If God does His part and you do not do your part, then you will not be saved. Even if God does 99% and you do 1%, then that is still percentage theology. Calvin said that it does not matter how small of a percentage you believe you do, if there is anything there, even a crumb of righteousness, then by that much it is going to diminish the glory of God's righteousness. So the doctrine of justification by faith alone is the only teaching that can fully honor God and allow His glory to stand undiminished.