Pope Pius XII
Mystici Corporis Christi §6
Mystici Corporis Christi: On the Mystical Body of Christ
6 There is a special reason too, and one most dear to Us, which recalls this doctrine to Our mind and with it a deep sense of joy. During the year that has passed since the twenty-fifth anniversary of Our Episcopal consecration, We have had the great consolation of witnessing something that has made the image of the Mystical Body of Jesus Christ stand out most clearly before the whole world. Though a long and deadly war has pitilessly broken the bond of brotherly union between nations, We have seen Our children in Christ, in whatever part of the world they happened to be, one in will and affection, lift up their hearts to the common Father, who, carrying in his own heart the cares and anxieties of all, is guiding the barque of the Catholic Church int he teeth of a raging tempest. This is a testimony to the wonderful union existing among Christians; but it also proves that, as Our paternal love embraces all peoples, whatever their nationality and race, so Catholics the world over, though their countries may have drawn the sword against each other, look to the Vicar of Jesus Christ as to the loving Father of them all, who, with absolute impartiality and incorruptible judgment, rising above the conflicting gales of human passions, takes upon himself with all his strength the defence of truth, justice and charity.
Source: Mystici Corporis Christi (Vatican.va)