Why are so many great Lutheran books called “Commonplaces” or “Loci”?

Many classic Lutheran books of theology have similar titles. What do these similar names mean and where did they come from? 

The History of Luther’s Church Postil

The Church Postil consists of Luther’s sermons for the church year. Luther began working on it while hiding out at the Wartburg in 1521. Alongside his translation of the New Testament into German, he intended that the Church Postil should bring the reformational, Gospel message to ordinary pastors and laypeople. Aside from his catechisms, Luther’s sermons for the church year, the postils, were his most influential writings for the common people. What follows is Dr. Benjamin Mayes’s introduction to LW 75, explaining how the Church Postil developed, was perfected by Luther, corrupted later, and only now has been restored to the form that Luther intended.

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