Mendelssohn wrote to his sister Fanny on November 22, 1830 that the motet was one of the best church pieces that he had ever written, and that it "growls angrily, or whistles, dark blue."[4]
For the first and second verses, the tenors and basses begin by contemplating a question, the sopranos and altos answering, and the tenors and basses finishing the answer. The tempo then speeds up, with a plea for mercy as the choir builds into a repeated "Kyrie eleison" sung at fortissimo. The third verse is structured differently, having all the parts sing throughout the verse. There is also no tempo change, but a few dynamic changes.