40 We have therefore two facts of supreme importance. As We said in Our discourse cited above: The Church placing at the disposal of families her office of mistress and educator, and the families eager to profit by the offer, and entrusting their children to the Church in hundreds and thousands. These two facts recall and proclaim a striking truth of the greatest significance in the moral and social order. They declare that the mission of education regards before all, above all, primarily the Church and the family, and this by natural and divine law, and that therefore it cannot be slighted, cannot be evaded, cannot be supplanted.
Source: Divini Illius Magistri (Vatican.va)