Discuss St. Thomas Aquina’s understanding of the relationship between the Church and the State.

Q. Discuss St. Thomas Aquina’s understanding of the relationship between the Church and the State.

St. Thomas Aquinas, a towering figure in medieval philosophy and theology, offered profound insights into the relationship between the Church and the State. His work, deeply influenced by Aristotelian thought and Catholic doctrine, framed a model of governance that was not only concerned with political authority and its exercise but also with the moral obligations and divine commands that undergird such authority. Aquinas' conception of the Church-State relationship is articulated in various works, particularly in his Summa Theologiae, where he addresses the nature of law, justice, and the role of the clergy in guiding the faithful to salvation. At the heart of his understanding is the idea that the Church and the State are distinct institutions with different ends, but they are not mutually exclusive; rather, they complement one another in serving both the temporal and the eternal needs of human beings.

The Dual Nature of Human Existence: Temporal and Spiritual Realms

Aquinas begins with the premise that human beings have both a temporal and a spiritual dimension. The temporal dimension refers to the physical and material aspects of life, governed by natural law and political authority. The spiritual dimension pertains to the soul's relationship with God, which is the concern of the Church. Aquinas draws heavily on Aristotle’s notion of the polis, the political community, while simultaneously incorporating Christian theology, emphasizing that the ultimate goal of human life is union with God. This distinction between the temporal and the spiritual realms is key to understanding Aquinas’ position on the Church and the State.


The temporal authority, embodied in the State, is concerned with the promotion of the common good, which includes securing peace, justice, and the well-being of the citizens. The State, in this context, operates under the natural law, which is accessible to human reason and can be applied by the rulers for the good of society. On the other hand, the Church is concerned with the salvation of souls, offering spiritual guidance through the sacraments and the proclamation of divine law, which is ultimately grounded in revelation and divine command.

Distinction and Cooperation Between Church and State

Aquinas is careful to differentiate the roles of the Church and the State. According to his doctrine, the Church and the State are two distinct powers with their own jurisdictions. The State has the authority to legislate and enforce laws that regulate the material and social aspects of life, while the Church’s role is to guide people toward salvation through spiritual means. This distinction reflects the idea that the Church and the State serve different ends—one temporal and the other eternal—but they are not antagonistic.

However, Aquinas also underscores the importance of cooperation between the two institutions. The ultimate aim of both the Church and the State is the well-being of the individual, and because the well-being of the individual involves both the temporal and the eternal, it is necessary for the Church and the State to work together. In cases where the temporal authority might act in ways that conflict with the ultimate salvation of souls, the Church has the authority to provide moral guidance and correction. For instance, if a ruler were to act unjustly or promulgate laws that undermined the common good or the moral order, the Church, through its spiritual authority, would have the responsibility to challenge such actions.

The Role of the Clergy in Political Life

Aquinas acknowledges that the clergy, as those entrusted with the care of souls, have a special role in guiding the temporal order. While the clergy do not exercise political power directly, their role is to influence the moral direction of the political community. The Church, under the guidance of its spiritual leaders, is tasked with teaching the natural law, providing counsel to rulers, and encouraging citizens to live according to moral precepts. In this sense, Aquinas envisions a relationship of mutual influence between the Church and the State, where the clergy help ensure that the rulers govern justly, and the State creates conditions that enable the Church to carry out its spiritual mission.


Furthermore, Aquinas contends that the Church has the authority to excommunicate or condemn rulers who act unjustly, particularly in cases where a ruler violates the natural law or divine commands. While the State possesses coercive power to enforce temporal laws, the Church, through its spiritual authority, can withhold the sacraments or impose excommunication on rulers who fail to act in accordance with divine law. This authority does not extend to temporal punishment but serves as a moral and spiritual check on political authority.

The Sovereignty of God in Political and Spiritual Matters

At the foundation of Aquinas’ view of the Church-State relationship is his belief in the ultimate sovereignty of God. While both the Church and the State exercise authority, that authority is derived from God. The political ruler, according to Aquinas, governs under the divine will and is responsible to God for the justice and well-being of the people. Similarly, the Church’s authority is based on its role as the dispenser of divine grace and the interpreter of God’s law. In this respect, the Church and the State both exist within the framework of God’s sovereign plan for the world. Aquinas emphasizes that the State is not independent of God’s will but must operate in a manner that is consistent with divine justice.

The principle of divine sovereignty also shapes Aquinas’ view of political legitimacy. Rulers are not legitimate by virtue of their power alone but because they have been entrusted by God to govern justly and for the common good. This divine mandate does not grant rulers unlimited power, however; rulers are bound by the natural law and must govern in accordance with justice. If they fail to do so, they risk losing their legitimacy in the eyes of God, and the Church has a responsibility to hold them accountable.

The Natural Law and the Common Good

Aquinas’ view of law is crucial to understanding his conception of the relationship between the Church and the State. Central to Aquinas’ political theory is the idea of natural law, which is the rational knowledge of the moral order embedded in creation and accessible to human reason. According to Aquinas, natural law serves as the foundation for both civil law and divine law. The natural law is universally binding and applies to all human beings, regardless of religious affiliation, as it is based on human nature and reason.

The State, in Aquinas’ view, is responsible for promoting the common good through the application of natural law. The role of the rulers is to enact and enforce laws that promote the welfare of society as a whole, and the law should be just, fair, and in accordance with the moral order. In this context, the Church also has a role to play in shaping the moral conscience of society. The Church’s teachings on natural law are meant to guide individuals in their moral decisions and to ensure that the political authorities govern in a way that is aligned with God’s will.

Aquinas acknowledges that human beings are fallible and that there will always be instances where laws conflict with the natural law. In such cases, the Church’s role becomes critical in challenging unjust laws and promoting moral reform. While the Church does not have the power to enforce civil law, it can wield significant moral authority in shaping the direction of political life. In this way, Aquinas sees the Church and the State as partners in the pursuit of justice and the common good, with the Church providing moral guidance and the State ensuring the material conditions necessary for the common good.

Aquinas on the Role of the Monarch and the Church’s Guidance

Aquinas provides a detailed analysis of the role of the monarch in his political writings. In his De Regimine Principum (On the Governance of Rulers), Aquinas argues that the monarch has the responsibility to govern according to the natural law and for the common good. A good monarch must be guided by virtue and must exercise authority with a sense of justice. Aquinas stresses that the monarch should not be an absolute ruler but must work in cooperation with the broader political community, including the Church.

While the monarch exercises political authority, Aquinas acknowledges that the Church provides moral guidance and serves as a check on the ruler’s power. The Church, through its clergy, can offer counsel to the monarch and provide spiritual direction to the people. The monarch is not above the law, and even the most powerful ruler is subject to divine law, which the Church has the responsibility to interpret and uphold. Aquinas’ model envisions a monarchy that is not absolute but is constrained by moral and divine laws, with the Church serving as a moral guide and sometimes a corrective force.

The Authority of the Pope and the King: The Question of Supremacy

One of the more contentious issues in the Church-State relationship is the question of the relative authority of the Pope and the king or emperor. Aquinas addresses this question in the context of the doctrine of potestas or authority. Aquinas asserts that the Pope, as the spiritual head of the Church, has supreme authority in spiritual matters, while the king or emperor has supreme authority in temporal matters. In cases where the spiritual and temporal authorities come into conflict, Aquinas argues that the Pope’s authority should prevail in matters of faith and morality, as the salvation of souls takes precedence over temporal concerns.

This does not mean, however, that Aquinas advocates for the Pope having direct control over temporal matters or political affairs. Rather, he affirms the distinct roles of the Church and the State and stresses that each should respect the authority of the other. The Pope, as a spiritual leader, guides the faithful, while the king, as a temporal ruler, governs the political community. Yet, in cases where political decisions undermine the moral or spiritual well-being of the people, the Pope, as the guardian of divine law, has the authority to intervene.

Conclusion: A Vision of Harmony Between Church and State

Aquinas’ vision of the relationship between the Church and the State is one of cooperation and mutual respect. While he recognizes the distinct roles and jurisdictions of each institution, he also affirms that the ultimate goal of both is the well-being of the individual, both in temporal and spiritual terms. The State is responsible for the material welfare of society and the promotion of justice, while the Church’s mission is to guide individuals toward salvation and moral virtue. Aquinas envisions a harmonious relationship between these two institutions, with each playing its proper role in the broader scheme of human flourishing.

In this vision, the Church does not dominate the State, nor does the State suppress the Church. Instead, the two institutions work together to promote the common good, with the Church offering moral guidance and the State ensuring the material conditions necessary for a just and flourishing society. Aquinas’ framework of Church-State relations reflects his deep commitment to the natural law, divine justice, and the ultimate sovereignty of God, which shapes both the political and spiritual dimensions of human existence.

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