12 And forgive us our debts,
As we forgive our debtors.
On Matthew 6 side of the cross (pre-crucifixion), the measure of forgiveness received from God was based on the measure of our forgiveness of others.
On our side of the cross (post-crucifixion), it’s based on the measure of Christ’s forgiveness of others.
Since Jesus took our place in the Great Exchange on the cross, all we have to do is get “into Christ”. We have been fully forgiven for an entire lifetime worth of legal indebtedness, therefore we extend the same grace others:
And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you.
bearing with one another, and forgiving one another, if anyone has a complaint against another; even as Christ forgave you, so you also do.
The measure of God’s forgiveness (100%, to be sure) is the measure of the forgiveness we are now empowered to extend to others. Otherwise, how could we give what we don’t already have?