Title: Encyclical letter (Mater et magistra) of His Holiness John XXIII by divine providence Pope to his venerable brethren the patriarchs, primates, archbishops, bishops, and all other local ordinaries that are at peace and in communion with the Apostolic See,and to the clergy and faithful of the entire Catholic world concerning a re-evaluation of the social question in the light of Christian teaching
First published: 1963