Zwingli believed that the mediæval Church had displaced the scriptural thought of _commemoration_, and put the non-scriptural idea of _repetition_ in its place. For the mediæval priest claimed that in virtue of the miraculous power given in ordination, he could really change the bread and wine into the actual physical Body of Jesus, and, when this was done, that he could reproduce over again the agony of the Cross by crushing it with his teeth. This idea seemed to Zwingli to be utterly profane; it dishonoured the One great Sacrifice; it was unscriptural; it depended on a priestly gift of working a miracle which did not exist. Then he believed that the sixth chapter of St. John's Gospel forbade all thought that spiritual benefits could come from a mere partaking with the mouth. It was the atonement worked out by Christ's death that was appropriated and commemorated in the Holy Supper; and the atonement is always received by faith. Thus the two principal thoughts in the theory of Zwingli are, that the mediæval doctrine must be purified by changing the idea of repetition of the death of Christ for commemoration of that death, and the thought of manducating with the teeth for that of faith which is the faculty by which spiritual benefits are received. But Zwingli believed that a living faith always brought with it the presence of Christ, for there can be no true faith without actual spiritual contact with the Saviour. Therefore Zwingli held that there was a Real Presence of Christ in the Holy Supper; but a spiritual presence brought by the faith of the believing communicant and not by the elements of Bread and Wine, which were only the signs _representing_ a Body which was corporeally absent. The defect of this theory is that it does not make the Presence of Christ in the Sacrament in any way depend on the ordinance; there is no sacramental presence other than what there is in any act of faith. It was not until Zwingli had elaborated his theory that he sought for and found an explanation of the words of our Lord, and taught that _This is My Body_, must mean _This signifies My Body_. His theory was entirely different from that of Carlstadt, with which Luther always identified it.