Invariably, priests who learn the Extraordinary (because it’s great, not because supposed to be rare) experience a shift in their understanding of Holy Mass and their position as priest/victim at the altar.
Here is a blurb I picked up from Messa in Latino, in turn from Fakebook. A priest learns that what what he was told in seminary about the Usus Antiquior was false. My translation.
Many among priests and laity in no way have enough knowledge about the ancient liturgy to make a judgment. I don’t really blame them (especially with regard to the clergy), since in the theological faculties professors do not teach about it at all, rather, they run it down it and ridicule it: I know it because I attended those liturgical courses and they did it in the classes that I heard.
But once coursework was completed, I studied on my own, thanks also to the prompting and example of the people I met and to the readings I did. I took an old missal directly into my hands and started to read it and study it, without making the mistake of my professors: I didn’t stop to say things, like, “Look what they were doing here! How many useless signs of the Cross!”. I went beyond, trying to understand the reason for so many things. Tackling the chore of understanding, I further deepened my readings and discovered symbolism and meanings of an extraordinary richness that the innovators decimated with a disconcerting ease.
Challenged by this, I had to change my point of view, I had to change my mind about the ancient liturgy and the aberrations of the new, which are its logical and inevitable consequences. The modern liturgy gives ample space to personal customization, the rubrics are often summary, and this more easily opens the way to aberrations, while in the ancient rite everything is well defined (the so-called “rubricism”, a word invented to denigrate and ridicule) and it leaves no room for creativity and improvisation of the celebrant, thus leaving the liturgy to speak for itself, and compels both the faithful and the priest towards eternal realities.