"This is a thorough reworking of an important book. The inclusion of scholarship, church teachings, revised translations and ecumenical voices from the past twenty-five years, added to an already substantial base of church tradition, makes this a significant revision. The addition of examples from liturgical history and the recently reformed euchology enhances and fleshes out key principles and premises. In an era when the blogosphere coverage of the liturgy often reflects ideology, division, and superficiality, this book lays out the terrain in a serene and careful manner. It is a book that deserves deep reflection and prayer."Abbot Jeremy Driscoll, OSB, Mount Angel Abbey and Seminary