Q. Why is a selection from the Book of Psalms always included in the Mass?
A. The lectionary reading in Mass designated as the “Responsorial Psalm” is most often from the Book of Psalms, but not always. It may be a psalm-like passage from another biblical book. For example, the “Responsorial Psalm” for December 22 is “The Song of Hannah” from 1 Samuel chapter 2.
Even so, the custom of