From Pope Pius XII’s encyclical Mystici Corporis Christi (1943):
From the outset it should be noted that the society established by the Redeemer of the human race resembles its divine Founder, who was persecuted, calumniated and tortured by those very men whom He had undertaken to save. We do not deny, rather from a heart filled with gratitude to God We admit, that even in our turbulent times there are many who, though outside the fold of Jesus Christ, look to the Church as the only haven of salvation; but We are also aware that the Church of God not only is despised and hated maliciously by those who shut their eyes to the light of Christian wisdom and miserably return to the teachings, customs and practices of ancient paganism, but is ignored and neglected, and even at times looked upon as irksome by many Christians who are allured by specious error or caught in the meshes of the world’s corruption. In obedience, therefore, Venerable Brethren, to the voice of Our conscience and in compliance with the wishes of many, We will set forth before the eyes of all and extol the beauty, the praises, and the glory of Mother Church to whom, after God, we owe everything.
And it is to be hoped that Our instructions and exhortations will bring forth abundant fruit in the souls of the faithful in the present circumstances. For We know that if all the sorrows and calamities of these stormy times, by which countless multitudes are being sorely tried, are accepted from God’s hands with calm submission, they naturally lift souls above the passing things of earth those of heaven that abide forever, and arouse a certain secret thirst and intense desire for spiritual things. Thus, urged by the Holy Spirit, men are moved, and as it were, impelled to seek the kingdom of God with greater diligence; for the more they are detached from the vanities of this world and from inordinate love of temporal things, the more apt they will be to perceive the light of heavenly mysteries. But the vanity and emptiness of earthly things are more manifest today than perhaps at any other period, when Kingdoms and States are crumbling, when enormous quantities of goods and all kinds of wealth are being sunk in the depths of the sea, and cities, towns and fertile fields are strewn with massive ruins and defiled with the blood of brothers.*
— Mystici Corporis Christi 3-4
* Pope Pius issued this document during the Second World War.