Militantis Ecclesiae §14

¹⁴ Even though the study of the arts and learning sheds so much glory on religion, those who dedicate themselves to these studies should use all their intellectual power and all their efforts to ensure that their knowledge not be selfish and sterile. Learned men should direct their studies to the profit of the Christian community and dedicate their own free time to common pursuits so that their knowledge may not seem an enterprise undertaken haphazardly but one which has practical application. Now such an obligation is especially clear in the instruction of youth, a work which is so important that it requires the greatest part of one's cares and effort.