It is almost impossible to overestimate the impact that Josef Andreas Jungmann, SJ, (1889-1975) and his work have had on the liturgical reforms which flowed from Vatican Council II. In Source and Summit editors and authors honor the memory of one of the greatest liturgical scholars of the twentieth century, not just by reflecting on Jungmann's past achievements, but by highlighting the trajectories of his influence on the life of the Church twenty-five years after his death and into the next century.

As a common starting point from which various authors offer reflections, Pierce begins by summarizing Jungmann’s essay "The Defeat of Teutonic Arianism and the Revolution in Religious Culture in the Early Middle Ages." Pierce and Downey then group the essays of Source and Summit into four general categories, which reflect four governing concerns: Jungmann’s own context, historical, and theological considerations, differing perspectives, and present and future implications. The first two groups of articles address the context out of which Jungmann’s essay (and the whole of his work) appears, either theologically or historically. The third group provides a spectrum of reflection from different denominational or methodological “lenses” that serve to expand on Jungmann’s immediate horizon. Finally, the fourth group of essays deal with more theoretical ramifications of Jungmann’s thought and work, critical ramifications that extend beyond the initial context and point to the liturgical future.

Essays and authors in Source and Summit are Foreword by Balthasar Fischer; “‘Christocentric’ and ‘Corporate’: Heretical Reverberations and Living Refrom in Western Christian Liturgy,” by Joanne M. Pierce; “Meticulous Scholarship at the Service of a Living Liturgy,” by Kathleen Hughes, RSCJ; “Restoring Equilibrium after the Struggle with Heresy,” by Gerard Austin, OP; “The Body of Christ in Celebration: On Eucharistic Liturgy, Theology, and Pastoral Practice,” by John Baldovin, SJ; “A Prophet Vindicated: Proclaiming the Good News,” by John Allyn Melloh, SM; “A Second Revolution,” by Thomas P. Rausch, SJ; “Fides Trinitatis: Liturgical Practice and the Economy of Salvation,” by Nancy A. Dallavalle; “‘Praise God from Whom All Blessings Flow’: Trinitarian Euchology in the Churches of the Reformation,” by Karen Westerfield-Tucker; “‘Somewhere Behind the World of Sensible Appearances’: The Liturgy as Contextual, Devotional, Trinitarian and Baptismal,” by Kenneth Stevenson; “Jungmann’s Challenge and the Churches of the East,” by Peter Fink, SJ; “‘The ‘We’ of the Liturgy’: Liturgical Reform, Pastoral Liturgy, and the Feminist Liturgical Movement,” by Marjorie Procter-Smith; “Ritual as Reading,” by Nathan D. Mitchell; “Pastoral Liturgy and Character Ethics: As We Worship So We Shall Be,” by Don Saliers; “Building a House for the Church,” by Michael Downey; “The Defeat of Visual Aesthetic Arianism,” by Mark Wedig, OP; “Liturgical Singing: A Case for Theologia Prima,” by John K. Leonard; “‘Lands Rich in Wine and Oil’: Culture and Conversion,” by Regis Duffy, OFM; and a bibliography of Josef Jungmann, SJ.