
Natural law is a philosophical and legal theory that asserts the existence of a set of inherent laws derived from nature and universal moral principles. The theory, which is rooted in natural theology, argues that humans can learn about God's attributes and intentions by examining the natural world and its functions. While the central ideas of natural law have been part of Christian thought since the Roman Empire, its foundation as a consistent system is attributed to Thomas Aquinas, a 13th-century theologian. Aquinas synthesized and condensed his predecessors' ideas into his Lex Naturalis, arguing that all human lives are sacred and possess an intrinsic set of rights. Modern natural law theory took shape in the Age of Enlightenment, drawing inspiration from Roman law, Christian scholastic philosophy, and contemporary concepts such as social contract theory. Over the centuries, natural law scholars have influenced the creation of institutions in modern Western democracies, including concepts such as individual rights, justice, and constitutionalism.
| Characteristics | Values |
|---|---|
| Date of creation | The natural law and natural rights tradition emerged in the 17th and 18th centuries |
| Key figures | Thomas Aquinas, Albertus Magnus, Gratian, Coke |
| Definition | A philosophical and legal theory that posits the existence of a set of inherent laws derived from nature and universal moral principles, which are discoverable through reason |
| Relation to human law | Natural law is more influential and binding than man-made laws |
| Relation to divine law | Natural law is God's wisdom that can be seen and observed in the natural world |
| Relation to theology | Natural law is rooted in Natural Theology, a genre of Christian theology that asserts that humans can learn about God's attributes and intentions by examining the universe, its functions, and its inhabitants |
| Relation to morality | Natural law holds that all people, whatever their ethnicity, culture, or religion, can know the difference between good and evil, right and wrong |
| Relation to politics | Natural law has had a significant impact on the development of political thought in the Western tradition |
| Relation to economics | Natural law has influenced the development of economic thought in the Western tradition |
| Relation to society | Natural law has influenced the creation of the institutions of modern Western democracies, including individual rights, justice, private property, rule of law, constitutionalism, and limited government |
| Dynamic nature | Natural law is not a static tradition of thought; it has developed over time through theorists clarifying particular concepts and proponents responding to intellectual challenges and changes in politics, society, and the economy |
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What You'll Learn

Natural law in Christian thought
Natural law is a philosophical and legal theory that asserts the existence of a set of inherent laws derived from nature and universal moral principles. It is discoverable through reason and is independent of enacted laws or societal norms. Natural law theory holds that certain rights and moral values are inherent in human nature and can be universally understood.
In Christian thought, natural law has been a central idea since the Roman Empire. The theologian Thomas Aquinas, born in 1225, laid the foundation for a consistent system of natural law, synthesizing and condensing the ideas of his predecessors into his Lex Naturalis ('natural law'). Aquinas argued that because human beings possess reason, and because reason is a spark of the divine, all human lives are sacred and of infinite value. This intrinsic basic set of rights bestowed upon every human cannot be revoked by anyone. Aquinas further taught that all human or positive laws should be judged by their conformity to the natural law. An unjust law is not a law in the true sense of the word, but merely retains the 'appearance' of being one.
The concept of natural law is grounded in the concrete character of God as the Good. It is not based on an abstract concept or a neutral notion of 'nature', but rather on the concrete character of God. The Triune Creator infused His creation with laws derived from His own eternal law (lex aeternus). Aquinas described the natural law as "the sharing in the eternal law by the rational creature". God, according to Aquinas, providentially governs all of His creation, including humans, animals, non-animal life, and inanimate objects, according to His wisdom. The first object that the human intellect knows, according to Aquinas, is 'being'. God is Himself 'pure being' (purus actus) and is the source of all contingent being, such as the universe, maintaining such being.
Proponents of natural law contend that humans can recognize God's moral inclinations in nature and creation. This is because all human beings already possess some knowledge of God and His moral inclinations, which are imprinted on the soul of every person. Aquinas asserted that at creation, God imprinted human beings with His own moral inclinations, stating, "God has imprinted in creatures their inclinations to their proper acts and ends, in accordance with God's eternal plans". Thus, humans have inclinations toward proper and good behaviors.
Natural law has had a significant influence on the development of moral, political, legal, and economic thought in the Western tradition. It has contributed to the enhancement of freedom in these realms, shaping the institutions of modern Western democracies, including individual rights, justice, private property, rule of law, constitutionalism, and limited government.
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Natural law and natural rights
Natural law is a philosophical and legal theory that asserts the existence of a set of inherent laws derived from nature and universal moral principles. It is the theory that the design and functions of the natural world help us to understand what is right and good. Natural law theory holds that certain rights and moral values are inherent in human nature and can be understood universally, independent of enacted laws or societal norms. It is sometimes referred to as iusnaturalism or jusnaturalism.
The central ideas of natural law have been part of Christian thought since the Roman Empire, but its foundation as a consistent system was laid by Aquinas in the 13th century. Aquinas synthesised and condensed his predecessors' ideas into his Lex Naturalis ('natural law' in Latin). Aquinas argued that because human beings have reason, and because reason is a spark of the divine, all human lives are sacred and of infinite value compared to any other created object. This means that everyone is fundamentally equal and bestowed with an intrinsic basic set of rights that no one can remove. Aquinas taught that all human or positive laws were to be judged by their conformity to natural law, and that an unjust law is not a law in the full sense of the word.
Natural law scholars have influenced the creation of the institutions of modern western democracies, including individual rights, justice, private property, rule of law, constitutionalism, and limited government. The idea that we are all guided by a universal moral code of conduct has had a significant impact on the development of moral, political, legal, and economic thought in the broad Western tradition.
Natural rights are rights conferred on all people by nature or God, which no government or individual can deny or limit. The concept of natural rights is that individuals, as natural creatures, have rights that cannot be violated by anyone or any community. Natural rights are the rights that all persons are granted simply for being human. They are universal moral principles that apply to all cultures and societies, and they are unaffected by political legislation. As a result, natural rights are frequently referred to as inalienable rights, or rights that cannot be taken away.
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Natural law in politics and economics
The concept of natural law has a long history, dating back to ancient Greek and Roman philosophy, with influential figures such as Aristotle and Cicero. However, it was during the Scholastic period of the Middle Ages, from the 11th to the 14th centuries, that natural law was more formally developed and integrated into Christian theology. Thinkers such as Thomas Aquinas, a key figure in this era, sought to reconcile faith and reason, and his work had a significant impact on the development of natural law theory. Aquinas proposed that natural law was based on eternal law, which was part of the divine reason. This natural law was accessible to humans through their reason and provided a basis for moral behavior.
During the Enlightenment in the 17th and 18th centuries, natural law ideas underwent a secular transformation. Thinkers such as Thomas Hobbes, John Locke, and Jean-Jacques Rousseau used natural law concepts to argue for certain inalienable rights, such as life, liberty, and property. These ideas were influential in the development of democratic political theories and had a significant impact on documents such as the US Declaration of Independence and the Constitution. Natural law, in this context, provided a basis for justifying political and social contracts, and the rights and duties of citizens.
In economics, natural law theory has been used to argue for certain inherent principles that govern economic behavior. For example, the concept of the "invisible hand" proposed by Adam Smith suggests that individuals acting in their own self-interest can unintentionally benefit society as a whole. This idea aligns with natural law thinking, suggesting that there are natural principles that guide economic behavior toward beneficial outcomes. Similarly, the concept of "economic natural law" suggests that there are inherent laws that govern economic phenomena, such as supply and demand, and that these laws operate independently of human intervention.
Natural law theory has also been applied to international relations and global politics. For instance, the idea of "natural rights" has been used to argue for the universal applicability of certain human rights across all cultures and nations. This perspective suggests that there are fundamental rights that all humans possess by virtue of their humanity, and these rights should be respected and protected by all political and legal systems. Similarly, natural law thinking can inform debates about global justice and the creation of international laws and institutions that transcend national boundaries.
In contemporary politics, natural law theory continues to influence debates about ethics and policy-making. For example, discussions about environmental ethics often draw on natural law concepts, arguing that there are inherent values in nature that should be respected and preserved. This perspective can inform policies related to conservation, sustainability, and the protection of natural resources. Similarly, in the field of bioethics, natural law theory can guide discussions about the ethical implications of emerging technologies, such as genetic engineering or artificial intelligence, by providing a framework for evaluating the potential impacts of these technologies on human dignity and natural order.
Overall, the concept of natural law has had a significant influence on the development of political and economic thought. By providing a framework for understanding inherent rights, duties, and principles, natural law theory has shaped debates about justice, ethics, and the role of government. While the interpretation and application of natural law have evolved over time, it remains a relevant and influential concept in contemporary politics and economics, guiding discussions about rights, responsibilities, and the pursuit of the common good.
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Natural law in jurisprudence
Natural law is a philosophical and legal theory that asserts the existence of a set of inherent laws derived from nature and universal moral principles. These laws are discoverable through reason and are thought to be independent of enacted laws or societal norms. In the context of jurisprudence, natural law is sometimes referred to as iusnaturalism or jusnaturalism. It holds that there are objective legal standards based on morality that underlie and inform the creation, interpretation, and application of human-made laws. This view contrasts with legal positivism, which emphasises that laws are created by human authorities and are not inherently tied to moral principles.
The concept of natural law has its roots in the Christian thought of the Roman Empire, but it was Aquinas in the 13th century who laid the foundation for a consistent system of natural law. Aquinas synthesised the ideas of his predecessors, arguing that because humans possess reason, which is a spark of the divine, all human lives are sacred and of infinite value. This intrinsic equality, according to Aquinas, comes with a basic set of rights that cannot be taken away. Aquinas's work provided a moral restriction on the power of the state and justified the idea of a social contract, positive law, and government, contributing to the development of classical republicanism.
The modern natural law theory took shape during the Age of Enlightenment, drawing inspiration from Roman law, Christian scholastic philosophy, and contemporary concepts such as social contract theory. Natural law played a significant role in challenging the theory of the divine right of kings and shaping the understanding of legal rights. Over the centuries, natural law scholars have influenced the creation of institutions in modern Western democracies, including individual rights, justice, private property, rule of law, constitutionalism, and limited government.
Natural law is not a static tradition but has evolved over time through the clarification of concepts and responses to intellectual challenges. It has informed debates about justice in changing contexts, such as the encounter between Europeans and the New World in the 15th century and emerging market economies in the 18th century. The influence of natural law can be seen in the enhancement of freedom in the political, legal, and economic realms.
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Natural law and human nature
Natural law is a philosophical and legal theory that asserts that a set of inherent laws derived from nature and universal moral principles can be discovered through reason. It is the idea that there is an objective moral order grounded in essential humanity, which has permanent implications for how we should conduct ourselves as free and responsible human beings. Natural law theory holds that certain rights and moral values are inherent in human nature and can be universally understood, independent of enacted laws or societal norms.
The concept of natural law has its roots in the discipline of natural theology, which is a genre of Christian theology. It asserts that humans can learn about God's attributes and intentions by examining the natural world, its functions, and its inhabitants. The Bible, for example, commands us to learn from nature and creation. Proverbs 6:6-8 says: "Go to the ant, O sluggard; consider her ways, and be wise. Without having any chief, officer, or ruler, she prepares her bread in summer and gathers her food in harvest." Here, the author rebukes a lazy person, telling them to learn from the ants and embrace hard work and the willingness to prepare for the coming season.
The foundation of natural law as a consistent system is attributed to Thomas Aquinas, a 13th-century theologian. Aquinas synthesized and condensed the ideas of his predecessors into his Lex Naturalis (natural law). He argued that because human beings possess reason, and because reason is a spark of the divine, all human lives are sacred and of infinite value compared to any other created object. This implies that everyone is fundamentally equal and endowed with an intrinsic set of basic rights that cannot be revoked. Aquinas further contended that God imprinted human beings with His moral inclinations at creation, and these inclinations guide us toward proper and good behaviors.
Natural law has had a significant influence on the development of moral, political, legal, and economic thought in the Western tradition. It has contributed to the creation of modern Western democratic institutions, including individual rights, justice, private property, the rule of law, constitutionalism, and limited government. However, the understanding of natural law and its influence on specific norms and institutions have diminished in the 21st century compared to a century ago.
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Frequently asked questions
Natural law is a philosophical and legal theory that asserts that the design and functions of the natural world help us understand what is right and good.
The central ideas of natural law have been part of Christian thought since the Roman Empire. However, its foundation as a consistent system was laid by Aquinas in the 13th century. Modern natural law theory took shape in the Age of Enlightenment.
Natural law holds that all people, regardless of ethnicity, culture, or religion, can know the difference between good and evil, right and wrong, and are free to make choices for the good. It also asserts that certain rights and moral values are inherent in human nature and can be understood universally, independent of enacted laws or societal norms.
Natural law posits that there are objective legal standards based on morality that underlie and inform the creation, interpretation, and application of human-made laws. It argues that human laws should be judged by their conformity to natural law, and that natural rights are not created by governments but rather exist prior to and independently of them.











































