The word or idea of Liturgy is disappearing in some new church movements and is not always taken that seriously in some churches. This book takes the idea and the word seriously, describing something of what it originally meant when the early church drew on its "maximal" meaning from its usage in the Greek city States from about the 5th century BC onwards. . How does this affect our perception of the split between the sacred and the secular made so often by Christians now? Why are such dualisms dangerous, or at least a reduction of the meaning of Liturgy? How does the Liturgy of the Church mean more than worship? How does it overflow into the Liturgy of the World? If something of this orientation could be rediscovered what difference might it make? Drawing on brief references to early mystical writers like Pseudo-Dionysius, Origen, Maximus the Confessor, the Cappadocians, as well as the Cloud of Unknowing, St John of the Cross, Julian of Norwich, T.S.Eliot, Olivier Clement, Rowan Williams, Karl Rahner and Alexander Schmemann, this book pauses to look at the meaning of mystery, sacrament and incarnation, as the context for the church's engagement with the world.