As we learn, for instance, in the way he reformed the Mass-
In his treatise on “The Canon of the Mass,”—dated IV. Cal. Septemb. (i. e., September 2) 1523—the canon is that part of the mass liturgy in which the words of the institution appear, and is therefore doctrinally the storm centre of discussion respecting it—he enunciates the doctrine now so commonly associated with his name that the Eucharist is not a mystery but a ministry, the atmosphere is not awe but love, the result is not infusion of grace but of enthusiasm; we remember Christ, and the thought of His presence stirs us to fresh exertion in His service. He proposed a substitute for the Latin prayers which still more strikingly would set forth these teachings.
Yet, characteristically he made no innovation himself at once. His books, however, laid down principles which logically followed out would oblige a complete break with the Old Church. Yet, so slow was he to make changes that on October 9, 1523, he actually defended himself against the charge that he retained the Old Church ceremonies—the use of the cross, vestments, choir-singing, etc.,—because he liked them!*
*Samuel Macauley Jackson, Huldreich Zwingli: The Reformer of German Switzerland (1484–1531); (New York; London: G. P. Putnam’s Sons; Knickerbocker Press, 1901), 201.