Here is the chapter on "Why in Latin?"
"Why are all your services in a language no one can understand?
They are not. The evening service always contains prayers in English.
The Mass, which is the central act of worship, is in Latin, for many reasons. The Catholic Church is not just the church of this or that country, it is world-wide. Its members feel at home, because they can take part in the same service, in the same language, all over the world.
Again, Latin being a dead language, is free from those changes in the meaning of words, inevitable to a modern language, and is therefore more suitable for expressing with exactitude those doctrines which never change, because eternally true.
Catholics attending Mass do not need to follow every word of the Mass. They understand that it is the official act of sacrifice, instituted by Christ, which the priest offers up in the name of Christ, for the people. They can either follow English translations in their prayer books, or join their own private prayers, in their own private way, to the official prayers of the priest.
The Mass is an act rather than a prayer.
It is both reassuring and good to see the clarity of Fr Tigar's reasoning and, though basic, the teaching is as true today as it was then.