Kantate, BWV 145 "Ich lebe, mein Herze, zu deinem Ergötzen"

Ich lebe, mein Herze, zu deinem Ergötzen (I live, my heart, for your pleasure), BWV 145, is a five-movement church cantata on a libretto by Picander which Johann Sebastian Bach, as its composer, probably first performed in Leipzig on Easter Tuesday, 19 April 1729. As a seven-movement pasticcio, with one of the added movements composed by Georg Philipp Telemann, it is an Easter cantata known as So du mit deinem Munde bekennest Jesum (as it was published in the 19th century) or as Auf, mein Herz! (after the incipit of the pasticcio's first movement).

Ich lebe, mein Herze, zu deinem Ergötzen is one of less than a dozen extant cantatas and fragments of what is known as Bach's Picander cycle, or his fourth cantata cycle. According to the first publication of the cycle's librettos, this cycle ran from 24 June 1728 (Feast of John the Baptist) to the fourth Sunday after Trinity, 10 July 1729.