Let it be repeated as an immutable and inviolable fundamental doctrine that matrimony was not instituted or restored by man but by God. Not by man were the laws made to strengthen and confirm and elevate marriage, but by God, the Author of nature, and by Christ Our Lord by Whom nature was redeemed; and hence these [marriage] laws cannot be subject to any human decrees or to any contrary pact, even of the spouses themselves.

by Pius XI | The proper and immediate aim of Christian education is to cooperate with divine grace in forming the true and perfect Christian… For the true Christian must live a supernatural life in Christ and display it in all his actions. For precisely this reason, Christian education takes in the whole of human life, physical and spiritual, intellectual and moral, individual, domestic, and social.