Some differences between the theology of Calvin and Luther
.. as you look at the two of them, there were disagreement concerned the relationship between church and state.
Luther held a somewhat negative view of civil magistracy, famously suggesting that failure at other pursuits could lead one to become a magistrate.
By contrast, Calvin elevated political office as a genuine Christian calling requiring believers to pursue excellence in service to God. This reflected broader differences in their understanding of secular authority...
Another difference impacted the liturgy : the worship and music in the the Church.
Calvin advocated for exclusive psalmody, believing that church worship should be limited to the Psalms as the biblical hymnal. Luther, however, embraced a broader view, composing hymns himself and understanding the importance of "psalms, hymns, and spiritual songs" as three distinct categories written and practiced in the Old - and New Testament communities.
The third area of divergence is the usage of the Law. Both Reformers acknowledged the Law's first use as a "schoolmaster" leading believers to Christ (as a paidagogos slave: Galatians 3:24-25) and accepted its civil use in governing society. However, Calvin granted the Law a more prominent positive role in Christian sanctification than Luther did.
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