() is an encyclical issued by Pope Pius XI in 1929 that concerns the education of Christian youth. Implicitly criticizing the educational policies of Fascist Italy, the document argues that the family and the Church have rights, over and above the state, to determine a child's course of education.
The document opposes coeducation at all ages of instruction, "particularly in the most delicate and decisive period of formation, that, namely, of adolescence". The prohibition of coeducation, which was also found in the 1917 Code of Canon Law, was lifted in the 1983 Code of Canon Law.
See also Ex corde Ecclesiae Gravissimum educationis
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