In 1997, Joseph Cardinal Ratzinger (later Pope Benedict XVI) published a volume under the title Milestones: Memoirs 1927 - 1977. In it he wrote:
There is no doubt that this new missal [after Vatican II] in many respects brought with it a real improvement and enrichment; but setting it as a new construction over against what had grown historically, forbidding the results of this historical growth, thereby makes the liturgy appear to be no longer a living development but the product of erudite work and juridical authority; this has caused us enormous harm. For then the impression had to emerge that liturgy is something ‘made’, not something given in advance but something lying within our own power of decision. From this it also follows that we are not to recognize the scholars and the central authority alone as decision makers, but that in the end each and every ‘community’ must provide itself with its own liturgy. When liturgy is self-made, however, then it can no longer give us what its proper gift should be: the encounter with the mystery that is not our own product but rather our origin and the source of our life. A renewal of liturgical awareness, a liturgical reconciliation that again recognizes the unity of the history of the liturgy and that understands Vatican II, not as a breach, but as a stage of development: these things are urgently needed for the life of the Church.
I am convinced that the crisis in the Church that we are experiencing today is to a large extent due to the disintegration of the liturgy, which at times has even come to be conceived of etsi Deus non daretur, in that it is a matter of indifference whether or not God exists and whether or not he speaks to us and hears us. But when the community of faith, the worldwide unity of the Church and her history, and the mystery of the living Christ are no longer visible in the liturgy, where else, then, is the Church to become visible in her spiritual essence? Then the community is celebrating only itself, an activity that is utterly fruitless. And because the ecclesial community cannot have its origin from itself but emerges as a unity only from the Lord, through faith, such circumstances will inexorably result in a disintegration into sectarian parties of all kinds - partisan opposition within a Church tearing herself apart.
This is why we need a new Liturgical Movement, which will call to life the real heritage of the Second Vatican Council.