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Do all Catholic seminary schools require instruction in Latin and/or Greek?
Not all Catholic seminaries require their seminarians to learn Latin unfortunately. Greek is often an elective in many seminaries. If a seminarian is studying from the Extraordinary Form of the Mass, then yes. The traditional Mass is said in Latin and a working knowledge of the Latin language is necessary.
More and more, younger priests are requesting more Latin in the seminaries. Chant is popular, and there's reams of it in the Graduale Romanum - in Latin. Architecture of chapels employs Latin in most classical schema. Biblical studies require Latin. Studying many Latin Church Fathers requires Latin. One cannot, for example, fully read Aquinas without sometimes turning to the Latin. Latin is not going away any time soon. - Do Catholic seminarians still learn Latin?
In any case Latin is required to be taught in Catholic seminaries according to Church Law.
Fr. Daniel Gallagher, a colleague here at Sacred Heart Major Seminary in Detroit, has just published a fine essay on the importance of Latin training for men preparing for priesthood. Of course, I think that anything promoting Latin, and anything by Fr. Gallagher, warrants reading, but among the many excellent points made about the importance of Latin competence was Fr. Dan's highlighting of 1983 CIC 249, which calls for proficiency in Latin among those seeking ordination, as well as competence in other pastorally useful languages. Nice use of canon law by a non-canonist.
I personally know of Catholic seminaries that do not teach Latin at all, yet will offer Greek to their students as an elective!
For those having a hard time with languages perhaps it would be fitting to invoke the aid of St. John Vianney who had a very hard time learning his Lain.