Missale Romanum

he office divinely committed to Us of feeding the Lord's flock has especially this duty assigned to it by Christ, namely, to guard with the greatest vigilance the deposit of the faith delivered to the saints, rejecting the profane novelties of words and oppositions of knowledge falsely so called. There has never been a time when this watchfulness of the supreme pastor was not necessary to the Catholic body; for, owing to the efforts of the enemy of the human race, there have never been lacking 'men speaking perverse things' (Acts xx. 30), 'vain talkers and seducers' (Tit. i. 10), 'erring and driving into error' (2 Tim. iii. 13).

2 Still it must be confessed that the number of the enemies of the cross of Christ has in these last days increased exceedingly, who are striving, by arts entirely new and full of subtlety, to destroy the vital energy of the Church, and, if they can, to overthrow utterly Christ's kingdom itself. Wherefore We may no longer be silent, lest We should seem to fail in Our most sacred duty, and lest the kindness that, in the hope of wiser counsels, We have hitherto shown them, should be attributed to forgetfulness of Our office.

Gravity of the Situation

4 That We make no delay in this matter is rendered necessary especially by the fact that the partisans of error are to be sought not only among the Church's open enemies; they lie hid, a thing to be deeply deplored and feared, in her very bosom and heart, and are the more mischievous, the less conspicuously they appear.

5 Though they express astonishment themselves, no one can justly be surprised that We number such men among the enemies of the Church, if, leaving out of consideration the internal disposition of soul, of which God alone is the judge, he is acquainted with their tenets, their manner of speech, their conduct. Nor indeed will he err in accounting them the most pernicious of all the adversaries of the Church. For as We have said, they put their designs for her ruin into operation not from without but from within; hence, the danger is present almost in the very veins and heart of the Church, whose injury is the more certain, the more intimate is their knowledge of her.