To forego self-conceit and to associate with the lowly means, in all soberness and without mincing the matter, to consider oneself the greatest of sinners. This arouses all the resistance of the natural man, but also that of the self-confident Christian. It sounds like an exaggeration, like an untruth…There can be no genuine acknowledgment of sin that does not lead to this extremity. If my sinfulness appears to me to be in any way smaller or less detestable in comparison with the sins of others, I am still not recognizing my own sinfulness at all…He who would serve his brother in the fellowship must sink all the way down to these depths of humility. How can I possibly serve another person in unfeigned humility if I seriously regard his sinfulness as worse than my own? Would I not be putting myself above him; could I have any hope for him? Such service would be hypocritical.
– Bonhoeffer, Life Together, pp. 96-97.