Why do we mourn for sin?

Mourning for sin is a significant response of a believer, echoing the deep realization of personal guilt and the recognition of the cost Jesus bore for our redemption. Zechariah 12:10 highlights that God's people will look upon Him whom they have pierced and mourn for Him. This mourning is not merely an emotional response but stems from understanding that our transgressions led to Christ's suffering and death. It fosters a heart of repentance and leads to a deeper appreciation for grace and forgiveness—that through Christ's sacrifice, our sins are atoned for, and we are brought into restored relationship with God.