Encyclical letter (Casti Connubii) of His Holiness Pius XI, by DivineProvidence Pope, to His Venerable Brethren the Patriarchs, Primates, Archbishops, Bishops and others that have ordinary jurisdiction, being at peace and in communion with the Apostolic See, on Christian marriage, in view of the present conditions and needs of the family and of society and the errors and vices which affect them