Reasons for Using Latin
Heresy and the Vernacular. Abandoning Latin for the vernacular is historically linked to heresy. “As Pater noster did build the Churches,” said a Catholic apologist during the persecutions in England, “Our Father did pull them down.”
(cited in Work of Human Hands, quoting Liturgical Discourse of the Holy Sacrifice of the Mass, 1670, 52).
As a fellow lover of the Latin mass, I must, nonetheless, contend that it is the both the rationale for the vernacular as well as the stark changes in wording and meaning which are fueled by, and thus inherently also, heresy. At least one of the reasons for the changes post-Vatican II is the deluded heretical notion of 'achieving' ecumenism, no matter the cost (!!), on the part of too many foolish 'shepherds'.