Ad Apostolorum Principis §53

⁵³ Venerable brethren and dear children, thus far We have told you of the anxiety with which we are moved by the errors which certain men are trying to sow among you, and by the dissensions which are being aroused. Our intention is that, enlightened and strengthened by the encouragement of your common father, you may remain steadfast and without blemish in that faith by which We are united and by which alone We shall obtain salvation.