"To eat the body of Christ sacramentally, if we wish to speak accurately, is to eat the body of Christ in heart and spirit with the accompaniment of the sacrament...You eat the body of Christ spiritually, though not sacramentally, every time you comfort your heart in its anxious query 'How will you be saved'...When you comfort yourself thus, I say, you eat his body spiritually, that is, you stand unterrified in God against all attacks of despair, through confidence in the humanity he took upon himself for you.
But when you come to the Lord's Supper with this spiritual participation and give thanks unto the Lord for his kindness, for the deliverance of your soul, through which you have been delivered from the destruction of despair, and for the pledge by which you have been made sure of everlasting blessedness, and along with the brethren partake of the bread and wine which are the symbols of the body of Christ, then you eat him sacramentally, in the proper sense of the term, when you do internally what you represent externally, when your heart is refreshed by this faith to which you bear witness by these symbols" (Zwingli's Fidei Expositio in "Reformed Confessions of the 16th and 17th Centuries pp.190-191).
Peter (W P) Stephens gives readers the idea that Zwingli was much closer to Calvin and the later Reformed than he was. Adam's quotation illustrates the problems with that claim however.
When Zwingli says "heart and spirit" we can see immediately that he was speaking in
psychological categories not in objective categories. Spirit here refers to the human spirit not to the Spirit of God. To put it bluntly, even crassly, even in Zwingli's very latest writings, Zwingli was still teaching only the intense psychological experience of remembering Jesus' death.
Even Zwingli's "highest" language is some ways from the language of Calvin, the Heidelberg or the Belgic. Zwingli would never say with the Belgic that, in the Supper, by the mysterious operation of the Spirit, believers eat the "proper and natural" body and blood of Christ!
BC Art 35 says:
In the mean time we err not when we say that what is eaten and drunk by us is the proper and natural body and the proper blood of Christ. But the manner of our partaking of the same is not by the mouth, but by the Spirit through faith.
HC 75 says, "that with His crucified body and shed blood He Himself feeds and nourishes my soul to everlasting life...."
This wasn't Zwingli's doctrine of the Supper. What takes place in the Supper is, at most, an internal psychological (I don't mean only intellectual, but also emotional) experience of remembering. For Calvin, the HC, the BC, and, I think, the Westminster Standards there is undeniably a memorial aspect to the Supper but that memorial aspect exhausts neither the Supper nor the operation of the Spirit through the Supper.
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ps.
Here's an essay on the Supper - free and online! This is my penance for always flogging books and published essays.
pps: I no longer agree with what I wrote (in '95 or '96) that, "Even Zwingli, who has sometimes been criticized for teaching that the Supper was a mere memorial of Christ’s death, taught that Christ strengthens us through the Supper."
postscript #3. Okay, I figured out how to turn this post into a way to flog a book! There is a chapter on the Supper and Christology in
Caspar Olevian and the Substance of the Covenant -- recently republished by RHB.