 In BWV 80a, he used the second stanza of Luther's hymn "Ein feste Burg ist unser Gott" ("A Mighty Fortress Is Our God"), which is "Mit unser Macht ist nichts getan" (With our might nothing is done), for the closing chorale.Bach could not use the earlier work at its intended time in Leipzig, because cantata music was prohibited there during Lent.The early Leipzig version (BWV 80b) began with a simple chorale setting of the hymn as the opening movement.