Hunwicke

In other words, for classical Protestantism, the Eucharist is an acted word; it is a sermon dramatised; it is intended to instruct the witnesses and draw their heart to that saving faith which justifies. But for the Catholic, it is an opus operatum; an action which by the powerful and indefectible promise of Christ is objectively (not merely subjectively and in the heart of the believer) effective. So the celebrant is not in the business of moving or instucting or edifying or converting the viewer - if such may be the the by-products, even useful ones, of the action, they are not its intrinsic purpose. The priest's intrinsic purpose is to confect and offer the Body and Blood of the Redeemer in sacrifice for the sins of men. Failure to realise this is at the heart of what is wrong with so much modern and 'relevant' liturgy; and, to judge from my own reading and experience, the error is just as pervasive and deep-rooted inside the Roman Communion as it is outside it.

http://liturgicalnotes.blogspot.com/2008/01/gabbling-mass.html