@Koza Nutria Certainly a Priest's obvious devotion and supernatural reverence contribute a great deal to the fruit which the faithful derive from the Mass, while the merits of the Mass itself remain infinite by virtue of
Who is being offered: Our Lord....much as our personal devotion, or lack thereof, is an important factor in how much fruit we derive from the Sacraments, which are efficacious according to our dispositions and preparedness to receive the graces they impart.
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This is one article I found quickly that discusses that. See
Proper dispositions:
"A sacrament gives grace of and by itself, by its own power.
"This is because Jesus attached grace to the outward sign, so to speak, so that that outward sign and grace always go together.
"But our own attitude does matter. Our interior dispositions have an effect on the amount of grace we receive. The more perfect is our sorrow in the sacrament of Reconciliation, the more ardent our love in receiving the Holy Eucharist, the more lively our faith in receiving Confirmation—then the greater will be the grace we receive.
"Our dispositions do not cause the grace; they simply remove the obstacles to the freer flow of grace and, in a sense, make more room for grace. We might illustrate this by saying that the more sand we empty out of the pail, the more water the pail will hold."--------------------
I've also read a number of times in various places over the years that the devotion of the Priest -- along with our own devotion -- will also impact the benefit one derives from the Mass for this reason, almost in the way the broadness of a channel determines the volume of water which can travel through it to those receiving it. It's a mystery, for sure.
I will say this, though, frequenting as I must both forms of the Mass (and I only go to the most conservative Novus Ordo parishes with Priests who are truly devout and love the Faith)...when I am able to return again to the Traditional Mass, it's as though a torrent of grace pours out effortlessly upon the soul throughout the Mass, lifting it up to the eternal mysteries -- it's transformative....
And many of my Novus Ordo friends whom I have introduced to the Traditional Mass say the same exact thing -- they are all amazed at how their spiritual lives deepen after attending the TLM for a very short time.
The Priest seems to disappear in the TLM, and his devotion or lack thereof seem to have little impact on the graces which the soul receives according to their preparedness.
When I go to even the most devoutly offered Novus Ordo Mass, I personally have to struggle against its humanistic, sterile influence which often affects us even sub-consciously -- the constant dialoguing back and forth with the Priest in the vernacular, instead of being plunged into silence before the Sacred Mysteries so the soul can speak with God alone; the bizarre wording of the Offertory which drops so much of the beautiful, mystical preparatory prayers and obscures almost completely the nature of the sacrificial offering as propitiation for sin; the precipitous nature of the abbreviated Canon and moving almost immediately through it to the closing of the Mass; the lack of reverence at Holy Communion, etc..
In fact, Father Ripperger addresses a great deal along these lines in the subject video.
So I just "disconnect" at the Novus Ordo and insulate myself in prayer until the Consecration (excepting the Priests' sermons, which are usually excellent at the N.O. churches I go to) and Holy Communion, which I certainly do derive spiritual benefits from, which is why I simply cannot stay away when the TLM is not possible.