J.D. Crichton, eminent in the liturgical movement for the last thirty years,editor of Liturgy a parish priest with an intensely pastoral as well as scholarly approach to the liturgy, wrote these words. He expands them in the detailed, expansive and entirely relevant commentary on the Constitution which makes this book. From this basis stem the discussion of the detailed proposals for the adaptation and reform of the liturgy, because of central importance, the Mass. Here arise the questions of English in the Mass how much, in what parts, for what reasons of holy communion in both kinds, of the preaching of the word and the ministry of the word, upon which the Council has laid such stress, and Concelebration.