21 In your country, Venerable Brethren, voices are swelling into a chorus urging people to leave the Church, and among the leaders there is more than one whose official position is intended to create the impression that this infidelity to Christ the King constitutes a signal and meritorious act of loyalty to the modern State. Secret and open measures of intimidation, the threat of economic and civic disabilities, bear on the loyalty of certain classes of Catholic functionaries, a pressure which violates every human right and dignity. Our wholehearted paternal sympathy goes out to those who must pay so dearly for their loyalty to Christ and the Church; but directly the highest interests are at stake, with the alternative of spiritual loss, there is but one alternative left, that of heroism. If the oppressor offers one the Judas bargain of apostasy he can only, at the cost of every worldly sacrifice, answer with Our Lord: "Begone, Satan! For it is written: The Lord thy God shalt thou adore, and Him only shalt thou serve" ( Matt. iv. 10). And turning to the Church, he shall say: "Thou, my mother since my infancy, the solace of my life and advocate at my death, may my tongue cleave to my palate if, yielding to worldly promises or threats, I betray the vows of my baptism." As to those who imagine that they can reconcile exterior infidelity to one and the same Church, let them hear Our Lord's warning: - "He that shall deny me before men shall be denied before the angels of God" ( Luke xii. 9).
Source: Mit Brennender Sorge (Vatican.va)