I was having a conversation with someone and he doesn’t believe in natural law. His reasoning is that morality exists because “the gradual human consensus” decided that certain things were wrong and right (murder, rape, etc.). So he believes things aren’t intrinsically wrong and if they are “intrinsically” wrong, they are so because the gradual human consensus decided it was.
I’m confused because I immediately think “who are the people deciding this? Which group of humans? Humans have never had consensus, what if the consensus is wrong? Isn’t your reasoning very superstitious? etc.” I should ask him these questions, but can anyone help me to make a case for natural law by first defeating his notions logically and providing a positive support of the law written in our nature?
The natural law exists because nature exists. As we are part of nature, it applies to us.
When lawyers were actually taught the Natural Law, a good many years ago, you would see it reflected in court opinions. When courts referred to the Natural Law, they conceived of it in three different fashion. One was the physical laws of nature, such as “water flows downhill”. Another was the “natural law of nations”, which was basically the common law of nations that they all recognized in regards to each other. The third was the Natural Law, being those rights, duties and obligations that apply to all human beings because they are human beings. They are innate. An example of that can be found in this pre Civil War quote from a U.S. Supreme Court opinion:
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The question, whether the slave trade is prohibited by the law of nations has been seriously propounded, and both the affirmative and negative of the proposition have been maintained with equal earnestness.
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That it is contrary to the law of nature will scarcely be denied. That every man has a natural right to the fruits of his own labour, is generally admitted; and that no other person can rightfully deprive him of those fruits, and appropriate them against his will, seems to be the necessary result of this admission. But from the earliest times war has existed, and war confers rights in which all have acquiesced. Among the most enlightened nations of antiquity, one of these was, that the victor might enslave the vanquished. This, which was the usage of all, could not be pronounced repugnant to the law of nations, which is certainly to be tried by the test of neral usage. That which has received the assent of all, must be the law of all.
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Slavery, then, has its origin in force; but as the world has agreed that it is a legitimate result of force, the state of things which is thus produced by general consent, cannot be pronounced unlawful.
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Throughout Christendom, this harsh rule has been exploded, and war is no longer considered as giving a right to enslave captives. But this triumph of humanity has not been universal. The parties to the modern law of nations do not propagate their principles by force; and Africa has not yet adopted them. Throughout the whole extent of that immense continent, so far as we know its history, it is still the law of nations that prisoners are slaves. Can those who have themselves renounced this law, be permitted to participate in its effects by purchasing the beings who are its victims?
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Whatever might be the answer of a moralist to this question, a jurist must search for its legal solution, in those principles of action which are sanctioned by the usages, the national acts, and the general assent, of that portion of the world of which he considers himself as a part, and to whose law the appeal is made.
The Antelope, 23 U.S. 66 (1825).
As you can see, in this opinion the majority recognized Natural Law, but at the same time found that the American statutory law contravened it and was actually opposed to it. An interesting opinion that’s basically the polar opposite of the Obegefll decision the Court just handed down.
Natural Law does in fact exist, and can be discerned irrespective of a person’s religious beliefs, although the ultimate author of it varies depending upon a person’s concept of metaphysics and religion. All human beings have certain things encoded in their DNA or somehow inscribed upon their hearts. All have a concept of property and that taking it from another is wrong. All have a belief that you can’t kill anyone you might get the urge to. All have the idea that taking anther’s spouse is wrong. All humans have a concept of kinship that varies only by some degree (even if it seems to hugely vary to us) and that there’s certain relationships that implies.
Indeed, in this day and age, to believe that this is only due to the gradual human consensus would display a stunning ignorance of science, as the better evidence would be that we’re born with certain concepts genetically in some fashion, not be gradual consensus.
As an aside to this, it’s interesting that it the Western World Natural Law is huge in certain fields, even though we don’t quite think of it that way. Conservationist and Environmentalist, for example, of all types basically found their beliefs on the Natural Law, ie., the laws of nature, and that its right or wrong for us to do certain things accordingly. We live in an era when “nature” is huge, except apparently in so far as how we view gender related topics, oddly.