Quote, I Think from Ragamuffin Gospel?

He who is alone with his sins is utterly alone. it may be that Christians, not withstanding corporate worship, common prayer, and all their fellowship in service, may still be left to their loneliness. The final breakthrough to fellowship does not occur because, though they have fellowship with one another as believers and as devout people, they do not have fellowship as the undevout, as sinners. The pious fellowship permits no one to be a sinner. So everyone must conceal his sin from himself and from their fellowship. We dare not be sinners. Many Christians are unthinkably horrified when a real sinner is suddenly discovered among the righteous. So we remain alone with our sin, living in lies and hypocrisy. That fact is that we are sinners!
—Dietrich Bonhoeffer