Forgiveness in the Church, Reflection on Matthew 18:18-20

Thinking about forgiveness and the congregatingness (congregatability?) of the congregation, I read Kathleen Norris' typically wonderful poem, Mrs. Schneider in Church:

Here's the first and last stanza:

It's the willingness to sing
that surprises me:
out of tune,
we drag the organist along
and sing, knowing we can't,
and our quite ordinary voices
carry us over.
....

Now we are changed,
making a noise
greater than ourselves,
to be worthy of the lesson:
all duly noted,
all forgiven.

(Excerpted from Cries of the Spirit, Beacon Press, ed. by Marilyn Sewell