The revelation of the historical course of the formation of the various parts of the Divine Liturgy requires diligent effort, multifaceted research, and systematic knowledge of all branches of Theology, from the history of Worship and doctrines to ecclesiastical literature, pastoral care, and the church's canons.

Only in this way can dark issues be illuminated and the evolutionary stages of the Liturgy clarified, which depicts not only the Eucharistic voice of the faithful people towards God but also the church's struggle with the elements of this world.

Excerpt from the Preface by Professor of Liturgical Studies Georgios Filias