Dom Prosper Guéranger, in The Liturgical Year, looks at the discourse of Peter at the Pentecost event. The multitudes had gathered for the Jewish Pentecost, the Spirit descended upon the Apostles and then the others. Peter began to speak.
All understood him in their own languages, a proof of divine inspiration. Guéranger compares Peter to the new Moses promulgating the new Law. Speaking of the new Law:
Thus did the second Moses promulgate the new Law. How must his hearers have welcomed the stupendous gift of this new Pentecost, which put them in possession of the divine realities foreshadowed by that figurative one of old! Here again, it was God revealing himself to His creatures, and, as usual, by miracles. Peter alludes to the wonders wrought by Jesus, who thus bore testimony to his being the Messias. He tells His audience that the Holy Ghost has been sent from heaven, according to the promise made to this Jesus by His Father: they have proof enough of the great fact, in the gift of tongues of which they themselves are witnesses …
