3 However - as we wrote to you - "you are opposing with a firm will all forms of insidious attack, whether subtle, hidden, or masked under a false appearance of truth" ( Ibid ., p. 155). We know that these words of Our previous Apostolic Letter were not able to reach you. So We willingly repeat them for you by means of this Encyclical. We know too, to Our great mental comfort, that you have persevered in your firm and holy resolve, and that no force has succeeded in separating you from the unity of the Church. For this We heartily congratulate you and give you deserved praise.
Source: Ad Sinarum Gentem (Vatican.va)