When we pray 'forgive us our sins' (or debts, or trespasses, or whatever version of the Lord's prayer we use) we are praying for the whole of the church.
I'm not just praying that God will forgive my sins; that's a tiny part of it. You are not just praying that God will forgive your personal sins. We are asking God to forgive all the failings of his church, no matter what they may be.
When we pray the Lord's Prayer we pray that God's kingdom will come, a kingdom that will sweep away all injustice and evil. When we pray the Lord's Prayer we take our stand as his light for the world. If we are honest we will come humbly, knowing that we his church have fallen short of all God wants us to be.
So we pray that God will forgive us our sins, and keep working in us so that we can do the job he has called us to. We pray believing in the kingdom and the role of God's church in it.
This Sunday we will be looking at the Lord's Prayer …. the way Jesus taught us to pray.