 is the title of two church cantatas by Johann Sebastian Bach.He composed a first version, 70a, in Weimar for the second Sunday in Advent of 1716 and expanded it in 1723 in Leipzig to ', a cantata in two parts for the 26th Sunday after Trinity.On 2 March 1714 Bach was appointed concertmaster of the Weimar court capelle of the co-reigning dukes Wilhelm Ernst and Ernst August of Saxe-Weimar.