"Latin is also important for maintaining the unity of the Church, because when people travel, and people travel more and more abroad nowadays, it is important for them to find the same echo that they heard from a priest at home, whether in the United States, South America, Europe, or anywhere else in the world. They are at home in any (Catholic) church. It is their Catholic Mass that is being celebrated. They have always heard the Latin words since childhood, their parents before them, and their grandparents before them."
January 1, 1970
https://en.wikiquote.org/wiki/Perpetual_virginity_of_Mary