Pope Pius XII
Mystici Corporis Christi §0
Mystici Corporis Christi: On the Mystical Body of Christ
0 ENCYCLICAL OF POPE PIUS XII ON THE MISTICAL BODY OF CHRIST TO OUR VENERABLE BRETHREN, PATRIARCHS, PRIMATES, ARCHBISHOPS, BISHIOPS, AND OTHER LOCAL ORDINARIES ENJOYING PEACE AND COMMUNION WITH THE APOSTOLIC SEE Venerable Brethren, Health and Apostolic Benediction. The doctrine of the Mystical Body of Christ, which is the Church, was first taught us by the Redeemer Himself. Illustrating as it does the great and inestimable privilege of our intimate union with so exalted a Head, this doctrine by its sublime dignity invites all those who are drawn by the Holy Spirit to study it, and gives them, in the truths of which it proposes to the mind, a strong incentive to the performance of such good works as are conformable to its teaching. For this reason, We deem it fitting to speak to you on this subject through this Encyclical Letter, developing and explaining above all, those points which concern the Church Militant. To this We are urged not only by the surpassing grandeur of the subject but also by the circumstances of the present time.
Source: Mystici Corporis Christi (Vatican.va)