Pope Pius XI encyclical entitled "Casti Connubii" which discusses the nature of Christian marriage

The source is an encyclical from Pope Pius XI entitled "Casti Connubii" which discusses the nature of Christian marriage. It is a call to the Catholic clergy and lay people to uphold the sanctity of the marriage bond and to understand the true meaning and purpose of Christian marriage. The document affirms the Church's position on the indissolubility of marriage and addresses challenges to the institution of marriage including the issue of divorce and the changing roles of men and women in society.