He who is alone with his sin is utterly alone. …The pious fellowship permits no one to be a sinner. So, everybody must conceal his sin from himself and from the 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. The fact is that we are sinners!
--Dietrich Bonhoeffer, Life Together