
The first principles of natural law are derived from the nature of the world and human beings. St. Thomas Aquinas, a prominent natural law theorist, asserts that the rational nature of humans defines moral law. According to Aquinas, the first principle of practical reason is that good is to be done and pursued, and evil is to be avoided. This principle serves as the foundation for all other precepts of natural law. Natural law theorists aim to identify the core goods and moral norms that guide human behaviour. They argue that these principles are not relative to culture, groups, or individuals but are universal and inherent in human nature. While some scholars like Grisez defend the idea of a master rule, others propose a method approach that focuses on distinguishing correct moral rules from incorrect ones. The interpretation and application of natural law continue to be a subject of debate among contemporary ethicists.
| Characteristics | Values |
|---|---|
| Natural laws are derived from nature and universal moral principles | "Good is to be sought, evil avoided" |
| Natural laws are discoverable through reason | "The rule and measure of human acts is the reason, which is the first principle of human acts" |
| Natural laws are based on morality | "The natural law expresses the original moral sense which enables man to discern by reason the good and the evil, the truth and the lie" |
| Natural laws are inherent in human nature | "Human beings are by nature rational beings, it is morally appropriate that they should behave in a way that conforms to their rational nature" |
| Natural laws are independent of enacted laws or societal norms | "One has not only a legal but a moral responsibility to obey just laws. Conversely, one has a moral responsibility to disobey unjust laws" |
| Natural laws are objective legal standards | "There are objective legal standards based on morality that underlie and inform the creation, interpretation, and application of human-made laws" |
| Natural laws are based on universal love | "One should love one’s neighbor as oneself" |
| Natural laws are based on practical reason | "Practical reason, unlike speculative reason, is inherently related to the appetites (reason directed to action)" |
| Natural laws are based on intrinsic values | "Human beings possess intrinsic values that govern our reasoning and behavior" |
| Natural laws are based on communal inquiry | "The first precepts of the natural law are to be understood as those that make possible communal inquiry into the nature of the good" |
| Natural laws are based on justice | "Both parties are bound to respect the notion of just prices on penalty of sin" |
| Natural laws are based on peace | "All men that mediate peace, be allowed safe conduct" |
What You'll Learn
- Natural law is derived from the nature of the world and human nature
- Natural law is discoverable through reason and is binding everywhere
- Moral norms are derived from the basic goods that constitute human fulfilment
- Natural law is a theory of ethics that says humans possess intrinsic values
- Natural law is distinct from positive law, which is not necessarily connected to morality

Natural law is derived from the nature of the world and human nature
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 believed to be inherent in human nature, guiding our reasoning and behaviour. According to Thomas Aquinas, the rational nature of human beings defines moral law. Since humans are rational beings, it is morally appropriate for them to behave in accordance with their rational nature.
In ethics, the natural law theory posits that humans have intrinsic values that determine how they reason and behave. These values are believed to be universal and independent of enacted laws or societal norms. Natural law theory is concerned with the foundations of practical reason, which is related to appetites and desirable possibilities such as life, truth, friendship, procreation, education, and religion.
The classical naturalist view acknowledges the role of human beings in creating natural law, but claims that this discretion is limited by moral norms. Legal norms promulgated by humans are only valid if they align with morality. This view is supported by the idea that there can be no legally valid standards that conflict with natural law, and that all valid laws derive their authority from it.
Natural law is often associated with the concept of justice and fairness. For example, in contractual relations, natural law requires the respect of commutative justice, where both parties are bound to uphold just prices. Similarly, in the penal code, certain crimes like murder and rape are universally accepted as punishable as they violate natural law by damaging the humanity of the victim and the social fabric.
Natural law is also relevant in economics, as seen in John Locke's theories about private property and economic goods. Adam Smith's "The Theory of Moral Sentiments" introduced a "system of natural liberty" with three natural laws of economics: self-interest, competition, and supply and demand.
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Natural law is discoverable through reason and is binding everywhere
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 believed to be binding everywhere.
Thomas Aquinas, a key proponent of natural law, explains that there are certain general precepts of natural law that are known to all. These include the primary precept of "Good is to be sought, evil avoided". According to Aquinas, these general principles of natural law are inherent in human nature and cannot be blotted out from men's hearts.
The theory of natural law holds that moral standards are derived from the nature of the world and the inherent nature of human beings. As rational beings, it is morally appropriate for humans to behave in a way that conforms to their rational nature. This forms the basis of the natural law, which is discoverable through reason.
Natural law is concerned with the foundations of practical reason and is applicable in various fields, including ethics, jurisprudence, and bioethics. In ethics, natural law theory posits that humans have intrinsic values that govern their reasoning and behaviour. These intrinsic values are believed to be universal and independent of enacted laws or societal norms.
The classical naturalist view acknowledges the role of human beings in creating natural law while maintaining that their discretion is limited by moral norms. Any legal norms promulgated by humans must be consistent with morality to be valid. This view asserts that natural law is binding everywhere and at all times, as articulated by Blackstone: "no human laws are of any validity if contrary to this; and such of them as are valid derive all their force, and all their authority... from this original."
In summary, natural law is discoverable through reason and is believed to be universally binding. This theory holds that moral standards are derived from the nature of the world and human nature, with humans inherently possessing rationality that guides their behaviour. While humans play a role in creating specific laws, these must align with moral principles to be valid, according to the classical naturalist view.
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Moral norms are derived from the basic goods that constitute human fulfilment
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 moral principles can be discovered through human reason. Natural law theory (NLT) holds that morality is based on human nature and human flourishing and can be understood through natural human reason.
The foundation of morality is the set of basic human goods: the fundamental intrinsic values and components of human flourishing that perfect human nature and provide reasons for action. Lists of basic goods usually include items such as life and health, knowledge, work and play, the appreciation of beauty, friendship, and religion.
The classical naturalist claims that human beings have considerable discretion in creating natural law. However, this discretion is necessarily limited by moral norms: legal norms that are promulgated by human beings are valid only if they are consistent with morality.
According to Grisez, the first principle of morality is that "In voluntarily acting for human goods and avoiding what is opposed to them, one ought to choose and otherwise will those and only those possibilities whose willing is compatible with a will toward integral human fulfillment". Grisez's master rule provides the basis for guiding choices toward overall human fulfillment. It gives unity and direction to a morally good life without excluding ways of living that might contribute to a complete human community.
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Natural law is a theory of ethics that says humans possess intrinsic values
Natural law is a philosophical and legal theory that posits the existence of a set of inherent laws derived from nature and universal moral principles. These laws can be discovered through reason and are not created by human authorities. Natural law theory in ethics asserts that humans possess intrinsic values that govern their reasoning and behaviour. This 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.
The idea that humans possess intrinsic values is a fundamental aspect of natural law theory. This means that humans have inherent worth and dignity, which should be respected and protected. These intrinsic values are believed to be derived from the nature of the world and the unique characteristics of human beings, such as their rational nature. According to St. Thomas Aquinas, a prominent proponent of natural law theory, the rational nature of human beings defines moral law. He states that “the rule and measure of human acts is reason, which is the first principle of human acts”.
Natural law theory suggests that moral norms and laws should be based on these intrinsic human values. For example, the right to life, liberty, and the pursuit of happiness, which is a motto based on natural law, is enshrined in the US Constitution. Additionally, natural law theory can be applied to ethical business practices, such as ensuring that a firm does not defraud its customers or stakeholders.
The identification and understanding of these intrinsic values is central to natural law theory. According to Alasdair MacIntyre, the first precepts of natural law enable humans to engage in a common pursuit of knowledge of what is valuable. This communal inquiry into the nature of the good helps establish the social relationships necessary for a complete human community.
Natural law theory also recognises that there may be discrepancies between different cultures and individuals in interpreting and applying these intrinsic values. However, it maintains that there are universal moral principles that transcend cultural and individual differences. These principles provide a foundation for distinguishing correct moral rules from incorrect ones, guiding choices towards overall human fulfillment.
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Natural law is distinct from positive law, which is not necessarily connected to morality
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 believed to be inherent in human nature, guiding our reasoning and behaviour. Natural law theory holds that there are objective legal standards based on morality that underpin and inform the creation, interpretation, and application of human-made laws.
In contrast, positive law, or legal positivism, emphasises that laws are rules created by human authorities and are not necessarily connected to moral principles. This school of thought suggests that a law can be unjust, but it remains a law. Positive law takes a more pragmatic approach, focusing on the rules created by human institutions and societies, rather than inherent or natural laws.
The distinction between natural law and positive law lies in their underlying principles and sources of authority. Natural law is rooted in the belief that certain rights and moral values are universal and inherent, existing independently of enacted laws or societal norms. It asserts that laws are discovered or found in nature, and that their validity is derived from their alignment with moral principles.
On the other hand, positive law is based on the idea that laws are created and established by human authorities, such as legislative bodies or customary practices. These laws are not necessarily tied to morality but are given force and authority by the institutions that create and enforce them. Positive law recognises the role of human discretion in creating and shaping the legal system, acknowledging that laws can be unjust but still hold legal validity.
The relationship between natural law and morality is complex. Natural law theorists like Thomas Aquinas argue that the nature of human beings defines moral law. Since humans are rational beings, it follows that behaving in a way that aligns with their rational nature is morally appropriate. Thus, natural law is derived from the inherent nature of humanity and the world. This view suggests a strong connection between law and morality, with natural law serving as a guide for ethical behaviour.
However, critics of natural law argue that it fails to account for cultural and individual differences in interpreting moral principles. Different people and cultures may have varying perspectives on fairness and justice, and natural law's universalising rules may not capture these nuances.
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Frequently asked questions
Natural law is a philosophical and legal theory that suggests there is a set of inherent laws derived from nature and universal moral principles. These laws are discoverable through reason and are believed to be independent of enacted laws or societal norms.
The first principles of natural law are the precepts that make possible communal inquiry into the nature of the good. They are the norms that enable humans to engage in the common pursuit of knowledge of what is valuable. These principles are derived from the nature of human beings, as Thomas Aquinas states, "the rule and measure of human acts is the reason, which is the first principle of human acts".
According to Thomas Aquinas, one must use their reason and apply it to his precepts. The primary precept is, "Good is to be sought, evil avoided". Aquinas also suggests that there are general precepts known to all, and more detailed secondary precepts that follow from the first principles.

