There is great virtue in simply remaining grounded in the Church’s teachings, following the liturgical books carefully, and minding your p’s and q’s. If nothing else, the Church can help to keep you under control.
That is certainly the case with, for example, the older, “Tridentine” form of Mass and the ad orientem celebration of Holy Mass.
The orientation of Mass and the rubrics for Mass (with the threat of mortal sin for violations) kept a priest in check so he wouldn’t impose too much of himself on the Mass and on the congregation.
The clarity of the Church’s doctrine provides enough grist for any sermon without straying into completely unknown fields and looking foolish as a result.
As if to underscore this, I found a great quotation of H.L. Mencken (+1956) who, while rather anti-Catholic, admired the Roman Church.
“This folly the Romans now slide into. Their clergy begin to grow argumentative, doctrinaire, ridiculous. It is a pity. A bishop in his robes, playing his part in the solemn ceremonial of the mass, is a dignified spectacle; the same bishop, bawling against Darwin half an hour later, is seen to be simply an elderly Irishman with a bald head, the son of a respectable police sergeant in South Bend, Ind. Let the reverend fathers go back to Bach. If they keep on spoiling poetry and spouting ideas, the day will come when some extra-bombastic deacon will astound humanity and insult God by proposing to translate the liturgy into American, that all the faithful may be convinced by it.” H.L. Mencken, Smart Set Criticism, October, 1923
Mencken was obviously a fan of Darwin, but you get the point.
The priest should stick to priestcraft (I am trying to rehabilitate that word from its bad connotation) and the liturgy should be handled so as to retain its mysterious power. When we try to make it too comprehensible we get into trouble and its impact is gone.
When doctrine, prayer, music and gesture are reduced to the lowest denominator, when we twist the rites to our own whims, we make what is glorious and uplifting merely dull and commonplace.
And people fall away.