Jon Walker in his book, In Visible Fellowship: A Contemporary View of Bonhoeffer’s Classic Work:  Life Together writes in chapter 30 about how confession is a break-through in the community of believers, Dietrich Bonhoeffer wrote…

In confession the break-through to community takes place. Sin demands to have a man by himself. It withdraws him from the community. The more isolated a person is, the more destructive will be the power of sin over him, and the more deeply he becomes involved in it, the more disastrous is his isolation.

Walker writes that The Big Idea of the chapter is…

Our sin hides in the darkness and whispers to us that it should remain unknown. And when we keep it in the darkness, it spreads within us like a toxin, and because we are a part of the Body of Christ, it seeps into our fellowship, eating away at obedience to Jesus. Even those who are spiritually mature can stumble into sin, and then be tempted to keep it in the dark.

Walker added:

…Bonhoeffer notes that when our sin is brought to light, it loses power over us–and over the community.

…we belong to a fellowship of sinners who live within the grace of God and so we should not fear confession because, in a community submitted to Jesus, confession brings us back in to alignment with God and one another. Our confession should, in a community submitted to Jesus, bring us in to great intimacy with each other because we are able to remove the final mask that keeps us truly knowing one another.

…To be like Jesus…

We must walk in the Light in faithful obedience to the truth that confession reduces the power of sin.

…In confession, we reveal, but God heals! 

(Jon WalkerIn Visible Fellowship: A Contemporary View of Bonhoeffer’s Classic Work: Life Together, Chapter 30)