What good can result to the people if they cannot know what the Priest is asking in their name?

The Catholic Answers

I have said that they can know if they wish, for they will find an English translation of the Mass in their prayer books. But even if they could not know, the Latin prayers could win for them the graces requested. If a German friend prayed for you in German, would that prayer be useless because you do not understand German?

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty