46 In general then it is the right and duty of the State to protect, according to the rules of right reason and faith, the moral and religious education of youth, by removing public impediments that stand in the way. In the first place it pertains to the State, in view of the common good, to promote in various ways the education and instruction of youth. It should begin by encouraging and assisting, of its own accord, the initiative and activity of the Church and the family, whose successes in this field have been clearly demonstrated by history and experience. It should moreover supplement their work whenever this falls short of what is necessary, even by means of its own schools and institutions. For the State more than any other society is provided with the means put at its disposal for the needs of all, and it is only right that it use these means to the advantage of those who have contributed them.
Source: Divini Illius Magistri (Vatican.va)