Here is a great quote from Bonhoeffer’s Life Together:
Since the confession of sin is made in the presence of a Christian brother, the last stronghold of self-justification is abandoned. The sinner surrenders; he gives up all his evil. He gives his heart to God, and he finds the forgiveness of all his sin in the fellowship of Jesus Christ and his brother. The expressed, acknowledged sin has lost all its power. It has been revealed and judged as sin. It can no longer tear the fellowship asunder. Now the fellowship bears the sin of the brother. He is no longer alone with his evil for he has cast off his sin in confession and handed it over to God. It has been taken away from him. Now he stands in the fellowship of sinners who live by the grace of God in the Cross of Jesus Christ. Now he can be a sinner and still enjoy the grace of God. He can confess his sins and in this very act find fellowship for the first time. The sin concealed separated him from the fellowship, made all his apparent fellowship a sham; the sin confessed has helped him to find true fellowship with the brethren in Jesus Christ.
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