If I ever got to write commentaries, my page headers will be organized as so:
4 is the number of the chapter of the book of the Bible
1 is the verse from the same chapter
This is the bomb.
Martin Luther. Luther’s Works, Volume 10: Lectures on the Psalms I. Edited by Hilton C. Oswald. Translated by Herbert J. A. Bouman. Concordia Publishing House, 1974.