13 Before beginning specifically ecclesiastical subjects, seminarians should be equipped with that humanistic and scientific training which young men in their own countries are wont to have as a foundation for higher studies. Moreover they are to acquire a knowledge of Latin which will enable them to understand and make use of the sources of so many sciences and of the documents of the Church. The study of the liturgical language proper to each rite should be considered necessary; a suitable knowledge of the languages of the Bible and of Tradition should be greatly encouraged.
Source: Optatam Totius (Vatican.va)