This document discusses the concept of repentance from passages in the Bible. It describes how the people listening to Peter's sermon in Acts 2 were cut to the heart when they realized they had crucified Jesus. Peter told them to repent. The document explains that repentance means turning away from sin and toward God, and that God offers his mercy and salvation through repentance to all people. It encourages readers to undergo an ongoing transformation by renewing their minds according to God's will.