It may come as a surprise to some readers that in AD 325 the Council of Nicaea did not only bequeath to the church a creed that, when expanded and clarified by the Council of Constantinople (381), laid the foundational framework within which trinitarian orthodoxy could be explained. The Council of Nicaea also left us a series of canons meant to govern ecclesiastical practice. Within these canons one finds the rudiments of a moral theology, rooted in Scripture and continuing a trajectory developed within the early church and beyond. As we celebrate the 1700^th anniversary of the council of Nicaea, most attention will be focused on the Creed that bears that council’s name, and rightly so. Yet twenty-first-century Christians would also do well to reflect on the canons of Nicaea in this, their seventeen-hundredth year. With this in mind, the following essay will consider the moral dimension of Nicaea, considering first the significance of the inclusion of canons with creed before reflecting on the contents and addressee of the canons, drawing implications for contemporary Christianity.

The Moral Significance of Nicaea

From time to time more revisionist theologians critique Nicene Christianity as a philosophical diversion from the political and ethical realities facing the people of God. Perhaps the claim is that ontological theology is divorced from the historical concerns of orthopraxis, or maybe the worry is that pro-Nicene theology emerged under the aegis of the Roman emperor Constantine, a context that could easily dissuade moral critique of the social sins of government and empire.^[1] Meanwhile, others have sought an ideal social system in the ontology of the Trinity, often reducing the Trinity to a pattern for society to emulate.^[2] While this approach does make the Trinity relevant to the ethical needs of the church, it often does so at the cost of Nicene orthodoxy.^[3] Such an approach is superfluous, for the Nicene council offers us the foundations of a moral theology in the twenty canons that were endorsed at the council. We need not base our ethics on the doctrine of the Trinity proper.

Those who crafted and confessed the Nicene Creed did not envision a sharp distinction between orthodoxy and orthopraxis. Indeed, in a literal sense, orthodoxy refers to correct worship, and such worship includes obedience to the law.^[4] Since the fulfillment of the law is summarized in the love of God and neighbor (Matt. 22:36–40), we can expect true worship to include love of God and neighbor. For this reason, it is no surprise that early liturgical formulations leading into the confession of the Nicene Creed are phrased accordingly. Jaroslav Pelikan points to an important example: “The Divine Liturgy According to Saint John Chrysostom” prefaces the recitation of The Niceno-Constantinopolitan Creed with the admonition: ‘Let us love one another, that with one mind we may confess Father, Son, and Holy Spirit! The Trinity, one in essence and undivided.’”^[5] He further clarifies that there is an assumption that worship “must always include a striving for moral purity.”^[6] As the creed increasingly became seen as a component of liturgical worship, its confession would be joined into the act of loving worship.

While the Creed’s ecclesial use was linked with moral formation in love, its contents and the contents of the adjoined canons were also crucial for moral formation. The final form of the Creed includes the affirmation of faith in “one, holy, catholic, and apostolic church,” phrasing introduced at Constantinople (381). These attributes of the church include an irreducible moral component, because confessing the church to be holy immediately prompts the question: What does it mean to be holy? Similarly, apostolic teaching in Scripture includes not only theology but ethics, which means that the apostolic church will preserve apostolic teaching in both areas. The creed’s usage and contents therefore imply a body of knowledge concerning right and wrong. Undoubtedly, this knowledge is contained in the Bible, yet the Bible itself assumes a need to interpret its principles ever anew as new moral situations arise.[1]  We see this, for example, in the Old Testament’s pairing of apodictic law (e.g., Exod. 20:13), which lays out specific prohibitions or duties, and casuistic law (e.g., Exod. 21:12–36), which contextualizes these duties within particular circumstances. Canons are thus the particularization of the basic principles of biblical ethics and moral theology in historical context. Given that the canons are affirmed at an ecumenical council, the assumption was that they ought to govern the global church. Over time, they were increasingly viewed as authoritative, particularly in Eastern Orthodoxy.^[7] Against modern critics, there simply is no divorce between theology and ethics in pro-Nicene thought.

Nicaea, Casuistry, and Moral Realism

We turn now to consider the contents of the canons of Nicaea.^[8] In one sense, there is little that is particularly novel in the canons. Yet careful reflection on their contents uncovers several important parameters for contemporary moral theology. I begin with the general tenor of the canons: they exemplify both casuistry and moral realism. The term “casuistry” is somewhat anachronistic here, since the term is more regularly associated in Christian circles with a later manualist tradition of Roman Catholic moral theology that attends to applying principles to difficult moral cases. As I am using the term, I merely intend to name what I have mentioned above: the canons assume the need to condition our moral response to the particulars in front of us. Moral reasoning cannot be reduced to relativism or to situation ethics, but neither can it be ignorant of context and particulars. [2] The same objective principles might play out in different ways in different contexts. Genre certainly matters for the Nicene Creed, which quickly became a confession of the corporate church and a component of baptismal liturgy. Similarly, the genre of the canons themselves matters: Christians would do well to attend to the particulars of concrete situations in their moral reasoning.

In my estimation, the general tenor of the canons also aligns with moral realism, which can be defined as a moral framework that emphasizes “that it is impossible fully to realize norms and ideals because sin is present in every person and every act, particularly self-interest and the desire to dominate and control others.”^[9] This is most evident in Nicaea’s canon 8, which provided for the readmission of the Novatians, also known as the Cathari. As J. N. D. Kelly concisely explains, “this was a rigorist, doctrinally orthodox movement, representing the party which advocated severity towards those who had lapsed in the Decian persecution and now wished to resume Church membership.”^[10] Canon 8 admits Novatianists who were moral rigorists toward those who had apostatized during persecution, provided the Novationists agree to accept the teaching of the Catholic church. Here we see leniency toward a schismatic group—and such leniency is also extended to those who denounced the faith and sought to rejoin. Yet note that the lapsed could not become priests (canon 10). Further, those who apostatized not under compulsion must complete twelve years of penance (canon 11), and catechumens who were in the process of joining the church but lapsed^[11]must wait three years as hearers only before rejoining the catechumens (canon 14).

The overall picture here is one of contextualizing such biblical teachings as “the one without sin among you should be the first to throw the stone” (John 8:7), “an overseer, therefore, must be above reproach” (1 Tim. 3:2), and “people will be forgiven every sin and blasphemy, but the blasphemy against the Spirit will not be forgiven. Whoever speaks a word against the Son of Man, it will be forgiven him” (Matt. 12:31–32). Requiring lapsed members of the church to do penance also relies on a theology of repentance and hamartiology that recognizes the weight of sin. Allowing apostates to rejoin the church rejects a moral rigorism or perfectionism in favor of a realism that recognizes that except for the grace of God, we might find ourselves equally weak in the flesh (Matt. 26:41). Nicaea thus points toward a general method of moral theology that accounts for the particulars of human contexts and extends grace given the realities of human fallenness while remaining committed to the objective principles of Christian ethics.

A Third Way

I write in a U.S. context, which leads me to recognize another benefit of the canons of Nicaea: they are not easily forced into either half of the American partisan divide. On a quick read, Nicene canons include affirmations of traditionalist sexual ethics and even a prohibition against genital mutilation that would make some progressives uncomfortable. At the same time, discussion of deposing those in clerical roles who return to military service and the rejection of priestly usury does not easily fit nationalist, promarket conservatism. While this combination of moral convictions may eschew American two-party political and cultural frameworks, a closer reading of the canons reveals a more nuanced framework that invites deeper theological engagement.

Canon 3 prohibits priests living with a woman, unless she is a relative “or any such person on whom suspicion cannot fall.” Though this prohibition likely targets both sexual abuse by clergy and adultery, the specific term used would even exclude cohabitation of priests with female ascetics.^[12] Canon 8’s teaching that Novatians rejoining the catholic church must accept widow(er)s who had remarried after the death of a spouse also assumes a traditional view of marriage and divorce. Canon 1’s prohibition of ordaining men who have made themselves eunuchs and its call to depose priests who self-mutilate has more to do with extreme asceticism than modern debates in transgender ethics.^[13] Nevertheless, these canons assume the goodness of the body and the need for sexual restraint in a manner that invites deeper theological consideration, situating these canons in the context of fourth-century theological analysis of the same subjects. Such reflection on the tradition could undoubtedly speak into contemporary debates on sexuality and gender.

Turning to social ethics, canon 5 establishes synods to examine excommunications to ensure these acts were not “inspired by a narrow-mindedness or quarrelsome disposition or any other spirit of animosity on the part of the bishop,” an effort to ensure institutions that promote procedural justice. Canon 17 demands that a priest who takes usury “or otherwise devises a scheme of dishonest profit” must be deposed. This canon set a longer trajectory that resulted in similar concerns in later ecumenical councils. For example, the second canon of Chalcedon rejected simony (the purchase of ecclesiastical offices) and the practice of priests being involved in business “for sordid gain,” such that priests were restricted to “farming estates” or “business” only in service of orphans, widows, and the poor (canon 3 from Chalcedon). Nicaea’s twelfth canon raises concerns about those priests who left the military only to return. Though this probably specifically targets service to the military under Licinius, who required soldiers to make a pagan sacrifice,^[14] the combined suspicion of profit and certain forms of military service undermines the claim that Nicaea represented a capitulation to the empire. Here, contemporary moral theology would also do well to understand these canons in the stream of broader pro-Nicene moral reasoning. Having done so, a fruitful social ethic in the Nicene tradition might destabilize decades-old battle lines in the culture wars.

The Church as Moral Subject

Stepping away from this survey of the contents of the canons of Nicaea, the addressee of these rulings is also important. These moral canons are interspersed with (and partially indistinguishable from) canons governing ecclesiastical processes like ordination and the Eucharist. It is clear that the moral addressee of Nicaea is neither the state nor the individual human being, but the church in its polity and as a gathered body.[3]  These precise decisions tailored to specific situations were designed to govern the church, and they were received as such, particularly in the Orthodox world.^[15] Here, we find a partial vindication of the modern framework of ecclesial ethics^[16] that would see the church as the primary moral community. Yet we also see a partial rejection of that same framework. Often, modern ecclesial perspectives seem to understand liturgy to be sufficiently formative, but the fathers at Nicaea understood the need for institutional and propositional guidance in addition to the moral dimensions of liturgy, such as the confession of the Nicene Creed in contexts of baptism and worship. The church remains a source of moral formation, but it is guided not only by practices that shape habits but by principles that shape reasoning and by social structures capable of enforcing moral standards.

The Canons of Nicaea for Protestants

As Protestants, this anniversary of Nicaea invites us to reflect on Protestant moral theology. We Protestants do not accept the ecclesiastical guidelines on questions such as the role of bishops or synods set forth at Nicaea, so we have tended to disregard canon law of this sort. However, it might be better to recognize all of the canons as contextual contributions to the polity and moral theology of the church. My own efforts to unravel the difficult puzzle of New Testament teaching on polity allows me to affirm genuine efforts to contextualize polity among Anglicans, Baptists, and Presbyterians alike (not to exclude many other polities in other denominations!). Yet, I would not go so far as to disregard the need for overseers, institutions dedicated to accountability, or criteria from Scripture and the tradition designed to help church polities perform their ministries morally and effectively. In other words, I generally do not see the ecclesiastical teachings of the canons as something Protestants ought to reject, but rather as guidelines we have chosen to recontextualize. Given this, I see no reason why we Protestants should ignore the canons and fail to draw moral insights from them, if we do the hard work of connecting them to their historical theological environments. By God’s grace, maybe there will be scholars retrieving the moral theology of Nicaea in the coming century to parallel the great retrieval efforts toward the dogmatic theology of Nicaea that we have seen in the last century. The church catholic, including its Protestant branches, would surely benefit from such work.

D. Glenn Butner Jr. is Associate Professor of Theology at Gordon-Conwell Theological Seminary. He researches in social ethics and dogmatic theology. He is author of five books, including Trinitarian Dogmatics (Baker 2022) and Christological Dogmatics (Baker 2026).

[1] We see both of these concerns raised against Athanasius of Alexandria’s Pro-Nicene functionalist Christology in Jon Sobrino, Christ the Liberator, Translated by Paul Burns (Maryknoll, NY: Orbis Books, 2001), 106–7. As is now well known, there is a close link between soteriology and trinitarian thought of both anti- and pro-Nicene theology. See, e.g., Khaled Anatolios, Retrieving Nicaea: The Development and Meaning of Trinitarian Doctrine (Grand Rapids, MI: Baker Academic, 2011), 99–156.

[2] For example, M. Douglas Meeks, God the Economist: The Doctrine of God and Political Economy (Minneapolis, MN: Fortress, 1989).

[3] There are strong methodological reasons to reject treating the Trinity as exemplary of the ideal society. I address these concerns elsewhere in D. Glenn Butner, Jr., Work Out Your Salvation: A Theology of Markets and Moral Formation (Minneapolis, MN: Fortress, 2024), 129–34.

[4] I would interpret this in terms of what Protestants call the third use of the law, where the law serves as a guide to the justified believer. I fully accept the principles of sola gratia and sola fide.

[5] Jaroslav Pelikan, Credo: Historical and Theological Guide to Creeds and Confessions of Faith in the Christian Tradition (New Haven: Yale University Press, 2003), 300–1. Emphasis added. The written liturgy of John Chrysostom can be traced to the fourth or fifth centuries.

[6] Ibid., 302.

[7] See Andreas Weckwerth, “The Twenty Canons of the Council of Nicaea,” in The Cambridge Companion to the Council of Nicaea, edited by Young Richard Kim (Cambridge: Cambridge University Press, 2021), 173–74. Later councils, popes, and bishops affirmed the Nicene canons, sometimes threatening excommunication to those who rejected them,

[8] Here I rely on the translation found in H. J. Schroeder, Disciplinary Decrees of the General Councils: Text, Translation, and Commentary (St. Louis: B. Herder, 1937). Future citations of Schroeder will reference his extensive commentary on the canons, while in-text citations will suffice for the canons themselves given their wide availability across numerous translations and texts.

[9] James F. Childress, “Realism,” in The Westminster Dictionary of Christian Ethics, ed. James F. Childress and John Macquarrie  (Philadelphia: Westminster, 1986), 527–28.

[10] J. N. D. Kelly, Early Christian Doctrines, rev. ed. (New York: Harper Collins, 1978), 204.

[11] Here, it is unclear whether moral sin or apostatizing during persecution is in view. Schroeder, Disciplinary Decrees, 44.

[12]Cross-referencing vocabulary used (suneisaktoi) against other decisions suggests “that this canon was directed against the cohabitation of a celibate clergyman with a female ascetic in the guise of a spiritual marriage without sexual contact.” Schroeder, Disciplinary Decrees, 21. This practice had occurred with several condemned priests, including Paul of Samosata. See William Bright, The Canons of the First Four General Councils of Nicaea, Constantinople, Ephesus, and Chalcedon, 2^nd ed. (Oxford: Clarendon, 1892), 10–11.

[13] See Schroeder, Disciplinary Decrees, 18–19. Note that the canons refer to priests, but Constantine and Hadrian both legislated more broadly against this practice.

[14] See Bright, Canons, 46–47; Schroeder, Disciplinary Decrees, 41–42; Weckwerth, “Twenty Canons,” 169. 

[15] Weckwerth, “Twenty Canons,” 158–59.

[16] See, e.g., Stanley Hauerwas and Samuel Wells, eds., The Blackwell Companion to Christian Ethics (Malden, MA: Blackwell, 2006).