Council of Trent: Session XXII, Sacrifice of the Mass, Chapter IX

CHAPTER IX. Preliminary Remark on the following Canons.

And because that many errors are at this time disseminated and many things are taught and maintained by divers persons, in opposition to this ancient faith, which is based on the sacred Gospel, the traditions of the Apostles, and the doctrine of the holy Fathers; the sacred and holy Synod, after many and grave deliberations maturely had touching these matters, has resolved, with the unanimous consent of all the Fathers, to condemn, and to eliminate from holy Church, by means of the canons subjoined, whatsoever is opposed to this most pure faith and sacred doctrine.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).