This would be a tough book to learn Latin from. It contains a great many errors. Perhaps the first is on page 5: "In debitoribus nostris, we have another case of both debitum and noster. First of all, they are plural, our debts, our trespasses; and they are in the ABLATIVE case. Forgive us with respect to, or as to, our trespasses." Of course, "debitoribus" means "debtors", not "debts", here in the dative. The book's typefaces make everything a little clearer, but it's still wrong. Or on the last page of the main text, "tria" is held to be feminine, whereas it is neuter (tres declines like any 3rd declension adjective). Or in the middle, where "prodest" is held to be from "prodeo" rather than "prosum". What is omitted may be just as serious, though harder to prove; for example, I did not see the explanation of the "i" in "omnia" anywhere. The tape explains the pronunciation of c before "e" and "i", but not the similar variation in the pronunciation of g nor the more complex variation in the pronunciation of t before i under certain circumstances. The tape accents spiritui on the first syllable, whereas it should be on the second. The tape contains a few false starts that could have been corrected. If you want to learn Latin, I would recommend enthusiastically Collins's "A Primer of Ecclesiastical Latin"; if you want more practice thereafter, by all means the annotated texts in McInerny's book can be helpful, and you will know you are mastering the language when you can spot errors similar to those mentioned above. As an admirer of McInerny's mystery novels and (though I am not really a qualified reviewer) his philosophical texts, as well as "Crisis" magazine which he edits, this book was a disappointment to me. But I will certainly give him an A+ for enthusiasm, which is apparent on virtually every page.