15 That is why We strongly encourage you to keep the schools in the fullness of the faith or to restore this fullness if necessary, and to bestow your cares on old as well as new schools, not only on primary schools but also on secondary schools and on colleges. As for the rest of the Catholics in your country, they should strive to preserve safe and intact the rights of the parents and those of the Church in the teaching of youth.
Source: Militantis Ecclesiae (Vatican.va)