The group of Weimar cantatas is exciting on many levels. The purpose Bach expressed in his Mühlhausen resignation letter is expressed through these Cantatas. Besides the beauty of the surviving works, which renders the loss of the missing ones all the more bitter, it is moving to see the musician engage, with each new piece, in experiments with form, ideas and the language for expressing the word of God through the most sensitive texts. The choice of developing themes dear to him enabled him to affirm and deepen his faith.