How Covenant Theology Took Shape in the Infant Baptism Debate
Looking at the Federal Theology of Bullinger
Introduction
The earliest full systematic expression of covenant theology in the Reformed tradition did not arise in abstraction, but under explicit institutional pressure to defend infant baptism against Anabaptist critique. Bullinger’s 1534 treatise—written at the direction of Zürich’s magistrates and approved for publication—represents not a neutral theological development later applied to baptism, but a system forged in direct response to that controversy.⁴
The Irony
Allow me to wear my polemics on my sleeve for a moment. One of the greatest ironies of all time is that some of the most articulate, nuanced, and theologically precise Christians on the planet have been known to throw all of that nuance and precision out the window on one topic: the topic that led Heinrich Bullinger to lay its foundation—covenant—for the expressed purpose of defending infant baptism. Were others in Bullinger’s realm already addressing the topic in response to Anabaptist claims? Certainly. However Bullinger’s argument was the first truly systematic treatment of covenantal baptism of infants.⁴
Why This Matters
It’s not as if infant baptism did not exist prior to this point. It certainly did. But the work of Bullinger influenced and was expanded upon by Calvin⁵ who in turn influenced Knox and others. The foundational elements of continental and English expressions of paedobaptist covenant theology run, at least in part, back to Zurich, and differ in substantial ways from every form of infant baptism that came before.
Does this mean that Bullinger is wrong? No (Nicaea was also formed as a response to real world happenings). What it does mean is that we have direct evidence of what led to its systemization. Moreover, the categories of thought utilized by Bullinger (De Testamento)⁴ while not yet formalized, are likely the very same categories that developed into the Westminster verbiage of substance and administration.⁶ While others ultimately contributed to this formalization process (both historically and theologically) it is without question that they drank heavily from Bullinger’s works.
From Zürich to Westminster
From Bullinger’s assertion of one eternal covenant administered in diverse ways⁴, through Calvin’s emphasis on the same grace under differing forms⁵, to Ursinus’s explicit distinction between substance and administration⁷—finally codified in Westminster⁶—the Reformed tradition did not invent a new idea, but progressively formalized categories already present in its earliest systematization.
Bullinger’s Formulation
“Testamentum Dei unum est atque aeternum… quamvis variis temporibus variis modis administretur.”⁴
“The covenant of God is one and eternal… although it is administered in different ways at different times.”
A Final Question
In light of this history, a quiet but important question remains: was Heinrich Bullinger’s covenant theology simply applied to the question of baptism, or was it, at least in part, shaped in the very process of defending it? Recognizing how these categories emerged does not settle the debate—but it does remind us that the system itself must be examined, tested, and grounded in Scripture, rather than assumed as a neutral starting point. Might we ask if it is appropriate to throw the baby out with the ex opere operato waters³ and allow the scriptures to be the ultimate proving ground of our religious and theological practices.
Historic Influences on Presbyterianism Covenant Theology
Zürich Mandate of March 18, 1532
“The Council has decreed that all preachers in the city and countryside shall submit a written defense of infant baptism against the Anabaptists, who claim the baptism of children is unbiblical.”⁸
Bullinger’s Own Report to the Council, 1533
“As Your Graces have commanded, I am working on a treatise on the one covenant of God to refute the errors of the Anabaptists, especially concerning the baptism of children.”¹
Council Minutes (Ratsprotokoll) – June 14, 1534
“Heinrich Bullinger has submitted the book on the one covenant and infant baptism, as ordered. The Council commends the work and orders it printed.”²
Bullinger’s Treatise
This 1534 work by Heinrich Bullinger—De Testamento seu Foedere Dei Unico et Aeterno (A Brief Exposition of the One and Eternal Testament or Covenant of God)—is widely recognized as the first major Reformed treatise devoted to covenant theology.⁴ It was explicitly developed in response to Anabaptist challenges, arguing for the unity of God’s covenant across the Testaments as the basis for continuing the practice of infant baptism (drawing continuity from Abrahamic circumcision to New Testament baptism of households).
Sources:
Bullinger’s Report (1533). Bullinger Correspondence Collection, StAZH E II 341, fol. 87. Published in: Swiss Reformation History, Vol. 2 (1920), p. 214.
“Wie Euer Gnaden befohlen haben, arbeite ich an einer Abhandlung über den einen Bund Gottes, um die Irrtümer der Wiedertäufer zu widerlegen, besonders was die Kindertaufe betrifft.”Council Minutes (June 14, 1534). State Archives of Zurich, B II 5, p. 412. Published in: Zurich Council and Marriage Court Protocols, ed. Strickler (1905), #1892.
“Heinrich Bullinger hat das buch vom einigen testament und kindertoufe, wie im befolen, übergeben. Der rat lobt das werck und ordnet es zu trucken.”Council of Trent, Session VII (March 3, 1547), Decree on the Sacraments, Canons on the Sacraments in General, Canon VIII.
“If any one saith, that by the said sacraments of the New Law grace is not conferred through the act performed [Latin: ex opere operato], but that faith alone in the divine promise suffices for the obtaining of grace; let him be anathema.”Heinrich Bullinger, De Testamento seu Foedere Dei Unico et Aeterno (Zürich, 1534); see also Charles S. McCoy and J. Wayne Baker, eds., Fountainhead of Federalism (Louisville: Westminster John Knox Press, 1991).
John Calvin, Institutes of the Christian Religion, II.x.2 (1559).
Westminster Confession of Faith, 7.5–6 (1646).
Zacharias Ursinus, Commentary on the Heidelberg Catechism, on Q&A 74.
Zürich Mandate (March 18, 1532). State Archives of Zurich, B VI 237, fol. 112r–113v. Published in: Egli, Collection of Documents on the History of the Zurich Reformation (1879), #1428.
“Der Rat hat beschlossen, dass alle Prediger in der Stadt und auf dem Lande eine schriftliche Verteidigung der Kindertaufe gegen die Wiedertäufer einreichen sollen, welche behaupten, die Taufe der Kinder sei unbiblisch.”
Note:
The English translations above were generated into modern English using Grok and lightly smoothed for readability. The original German texts are provided for accuracy and reference.