…Through these witnesses of the Holy Scriptures and a hundred more, which one may provide here, we say the pope’s Mass, which he claims to be an offering for the living and the dead, is false, and an impure sacrifice of bread according to Malachi (Mal. 1:7). So, through them Christ’s Supper and His sacrifice on the cross once accomplished, are in large measure abridged, and thus Christ’s blood is trampled upon. This proves that (the Mass) is only a human invention, which Gregory, who also instituted the Introit, Kyrie eleison, and the Canon, began to build in A.D. 594. Gelasius instituted the collects, hymns, tracts; and Sergio, A.D. 694, offertories, incense, and such like. Remnants of Pelagianism and scholasticism accounted for vigils, funeral services, and prayers read at set times, and such like. Likewise against the honor of Jesus Christ through the above inventions, they also claim purgatory’s reality, which was begun in A.D. 400, through people falsely embellished, and only confirmed in A.D. 1000. For through Christ (only), we have forgiveness and remission of our sins.
Johannes a Lasko, (1499–1560), Dutch Confession of 1566 in Reformed Confessions of the 16th and 17th Centuries, ed. James T. Dennison, Jr., (Grand Rapids: Reformation Heritage Books) 2.890