he Eucharist belongs to the entire church, universal as well as local. The dynamics of its structure are deeply rooted in the theology of God's grace and in the reality of human religious experience. The Eucharist, rooted in Scripture and Jewish prayer, has been shaped by centuries of tradition, and then reshaped as it was handed over from one culture to another. As if to signal that its elements were not subject to the whim of individual congregations or presiders, the Second Vatican Council's Constitution on the Sacred Liturgy stipulated changes could only be made by those authorized to do...