Just as the divine Redeemer, dying on the Cross, offered Himself as Head of the whole human race to the eternal Father, so also in this "clean oblation" (Mal 1:2), He, as Head of the Church, offers not only Himself but, in Himself, all His mystical members.
The Mystical Body of Christ: An Encyclical Letter Issued June 29, 1943 (ed. 1943)