69 The Church is the mystical Body of Christ, in which 'if one part is suffering, all the rest suffer with it.' Hence, since many of these members today are being tortured and maltreated, it is the sacred duty of the faithful to be united with them in a sincere and deep sympathy. In some parts of the missions the scourge of war has mercilessly razed to the ground churches and mission stations, schools and hospitals. To restore these losses and to reconstruct so many buildings, the whole Catholic world, which has proved its special care for and love of the missions, will generously furnish the necessary help."
Source: Evangelii Praecones (Vatican.va)