The Purpose of the Church
In Luke 24:46-47 (ESV) our Lord Jesus Christ says: "Thus it is written, that the Christ should suffer and on the third day rise from the dead, and that repentance and forgiveness of sins should be proclaimed in his name to all nations."
Therefore we confess with the words from Dr. Martin Luther's "Large Catechism", Article 3:
"We further believe that in this Christian Church we have forgiveness of sin, which is wrought through the holy Sacraments and Absolution, moreover, through all manner of consolatory promises of the entire Gospel. ...
Everything, therefore, in the Christian Church is ordered to the end that we shall daily obtain there nothing but the forgiveness of sin through the Word and signs, to comfort and encourage our consciences as long as we live here. Thus, although we have sins, the [grace of the] Holy Ghost does not allow them to injure us, because we are in the Christian Church, where there is nothing but [continuous, uninterrupted] forgiveness of sin, both in that God forgives us, and in that we forgive, bear with, and help each other." (bookofconcord.org)