The christian liturgy is first and foremost an opusoperatum. It is something much bigger than the deed of any one of us and than our own personal devotion. It is something that is first of all done apart from us, that has its own worth and power independently of our effort. We enter into its mighty current and allow ourselves to be borne along by it; our part, the opus operantis, is to allow ourselves to be subject to its power, to be covered over with its glory.

It should not surprise us that the christian liturgy is thus primarily an opus operatum. The christian liturgy stands at the heart of the christian religion; and the christian religion is first and foremost an opus operatum. It is not just a technique of spiritual culture; many pagan religions are that. Nor is it just a way of worship; that too can be found outside the Church. No, it is first and foremost the mighty act of God who in Christ is reconciling man to himself, and giving us in Christ a mediator and a great high-priest.