4 If, then, the tree of peace, which we planted on German soil with the purest intention, has not brought forth the fruit, which in the interest of your people, We had fondly hoped, no one in the world who has eyes to see and ears to hear will be able to lay the blame on the Church and on her Head. The experiences of these last years have fixed responsibilities and laid bare intrigues, which from the outset only aimed at a war of extermination. In the furrows, where We tried to sow the seed of a sincere peace, other men - the "enemy" of Holy Scripture - oversowed the cockle of distrust, unrest, hatred, defamation, of a determined hostility overt or veiled, fed from many sources and wielding many tools, against Christ and His Church. They, and they alone with their accomplices, silent or vociferous, are today responsible, should the storm of religious war, instead of the rainbow of peace, blacken the German skies.
Source: Mit Brennender Sorge (Vatican.va)