No modern Christian believes usury to be as grave a sin as Luther (and the Scriptures) assert here.
Discussion
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“Do not think that you are saved if you are a drunken pig day and night. This is a great sin, and everybody should know that this is such a great iniquity, that it makes you guilty and excludes you from eternal life. Everybody should know that such a sin is contrary to his baptism and hinders his faith and his salvation. Therefore, if you wish to be a Christian, take care that you control yourself. If you do not wish to be saved, go ahead and steal, rob, profiteer as long as you can… But if you do want to be saved, then listen to this: just as adultery and idolatry close up heaven, so does gluttony... Therefore be watchful and sober. That is what is preached to us, who want to be Christians... A drunkard is not dissuaded from his drinking by reason any more than a murderer, an adulterer, whoremonger, or usurer...What should move you is that God forbids it on pain of damnation and loss of the kingdom of heaven."
-Martin Luther, Sermon on Soberness and Moderation, 1539
Luther writes a surprisingly large amount about economics and inflation. He even has peculiar reasoning for why/how much Christians should save without falling into storing up treasures on earth.
We plan to cover Luther’s view of economics in an episode on the Bitcoin Reformation Podcast some day.