"Ars celebrandi": here too I would say that there are different dimensions. The first dimension is that the "celebration" is prayer and a conversation with God: God with us and us with God. Thus, the first requirement for a good celebration is that the priest truly enter this colloquy.
In proclaiming the Word, he feels himself in conversation with God. He is a listener to the Word and a preacher of the Word, in the sense that he makes himself an instrument of the Lord and seeks to understand this Word of God which he must then transmit to the people. He is in a conversation with God because the texts of holy Mass are not theatrical scripts or anything like them, but prayers, thanks to which, together with the assembly, I speak to God.
...Thus, to be well in tune, it is very important to understand this structure that developed over time and to enter with our "mens" into the "vox" of the Church. To the extent that we have interiorized this structure, comprehended this structure, assimilated the words of the liturgy, we can enter into this inner consonance and thus not only speak to God as individuals, but enter into the "we" of the Church, which is praying. And we thus transform our "I" in this way, by entering into the "we" of the Church, enriching and enlarging this "I," praying with the Church, with the words of the Church, truly being in conversation with God.