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Gravissimum educationis is the Second Vatican Council's Declaration on Christian Education. It was promulgated on 28 October 1965 by Pope Paul VI, following approval by the assembled bishops by a vote of 2,290 to 35.
The document is generally referred to, not by its English-language title, "Declaration on Christian Education", but by the opening words of its original Latin text, which mean "extremely important education".[1]
The document quotes at length from Divini illius Magistri (That divine teacher, 1929) by Pope Pius XI.[2]