The origins of this two-volume commentary set began with a series of four sermons that John Jebb preached on Psalm 32. Noticing the particular usage of the word "selah" in Psalm 32, Jebb began a study of the word throughout the entirety of the Psalms. This scrutinization of the text was the basis for the writing of over 700 pages of commentary on this Old Testament book, in which the first volume contains the full text with very minimal notes.