Keith F. Pecklers, SJ, is professor of liturgy at the Pontifical Gregorian University and professor of liturgical history at the Pontifical Liturgical Institute in Rome. He is the author of the following titles published by Liturgical Press: "Dynamic Equivalence: The Living Language of Christian Worship; The Unread Vision: The Liturgical Movement in the United States of America 1926-1955; Worship: A Primer in Christian Ritual"; and editor of "Liturgy for the New Millennium: A Commentary on the Revised Sacramentary". He is also the author of "Liturgy from Trent to Vatican II" included in the "H...