““Specifically, how are we to draw the boundaries of exclusion and inclusion in the life of the church? Sacrifice—the purity impulse—marks off a zone of holiness, admitting the “clean” and expelling the “unclean.” Mercy, by contrast, crosses those purity boundaries. Mercy blurs the distinction, bringing clean and unclean into contact. Thus the tension. One impulse—holiness and purity—erects boundaries, while the other impulse—mercy and hospitality—crosses and ignores those boundaries.””