http://w2.vatican.va/content/pius-xii/en/encyclicals/documents/hf_p-xii_enc_30091943_divino-afflante-spiritu.html
If Latin was the only language available to the "greatest Doctors" then that partially explains part of the problems we see in Roman Catholicism.
Linguistic knowledge ebbs and flows.
No doubt there are many causes to the present problems the Church faces, but I rather doubt that St. Thomas’ comparative lack of knowledge of Biblical languages is one of them. Augustine himself, while warmly recommending the study of the languages, had no Hebrew and was comparatively weak on Greek.
Why don’t you continue on to where Pius XII notes that any Catholic Scripture Scholar who neglects the study of these languages is guilty of “levity and sloth,” or quote Pius XI noting that every Catholic institute of higher education ought to make the Biblical Languages available (not required but available) to undergraduates?
Isaiah was enough for the Ethiopian eunuch.