Let Them? … If only they would! But let us not blame them. What have we priests done about it? Not that I think that everything is solved by lusty singing in church. Far from it! It is the whole picture of the people's part in the liturgy that we must keep constantly before our minds. Our first task is surely with the theological basis of the liturgical movement. It will be seen for what it is, a pastoral movement, when and only when its underlying theology has been studied especially in the light of the doctrine of the Mystical Body. This threefold movement of thought (theology of the Mystical Body), action (the Mystical Body at work in the lay apostolate) and liturgy (the Mystical Body at prayer) is a twentieth-century phenomenon only in so far as it is an organized movement.