Since the altar is the key to the identity of the community, exclusion from the altar is used to locate that identity. […] It is significant for the church, however that this limit does not establish a “lasting city.” The Eucharistic limit is meant to reveal the contours of the heavenly city on earth, not create an earthly city with permanent boundaries policed by a church analogous to the state. The limit is Eucharistic precisely because the church is on pilgrimage and must constantly receive itself anew from the Holy Spirit in the Eucharist. “Purity’ and “identity” are not attributes the earthly church can claim for itself, but rather characterize the eternal church as God sees it. (William T Cavanaugh, Torture and Eucharist, p.245)