 During the last aria, "Sei getreu, alle Pein" (Be faithful, all pain), the trumpet plays the chorale tune "Jesu, meine Freude" as a cantus firmus; Bach may have thought of the stanza "Weicht, ihr Trauergeister" (Go away, mournful spirits). The form of the aria follows the bar form of the chorale instead of the usual da capo form.
