Can You Ever Really Say What “Good” Means?
The Question That Hides in Every Definition
Imagine your teacher asks the class, “What does the word good mean?” A student named Maya raises her hand and says, “Good is whatever makes people happy.” Sounds reasonable. But then you think of someone who enjoys bullying — it makes them happy, but it’s not good. So you ask, “Is everything that makes people happy actually good?” Suddenly Maya’s definition doesn’t feel so certain.
A philosopher named G.E. Moore (1873–1958) built an entire moral theory out of moments like this. He noticed that, no matter what natural property you try to pin “good” onto — pleasure, being highly evolved, helping your community — you can always step back and ask, “But is that itself good?” This simple move became one of the most famous arguments in ethics.
Moore’s Secret Weapon: The Open-Question Argument
Moore lived at a time when many thinkers believed that moral words like “good” could be translated into facts about the natural world. Jeremy Bentham (1748–1832), for example, was a hedonist who said “good” means “pleasurable” or “produces pleasure.” Some evolutionary writers claimed “good” means “highly evolved.” Moore thought all these attempts made a serious mistake, which he called the naturalistic fallacy: assuming you have defined “good” just because you have linked it to some natural feature.
His main tool was the open‑question argument. Take any natural property a philosopher offers as the definition of “good” — say, “pleasant.” According to Moore, if “good” really just meant “pleasant,” then the sentence “Pleasure is good” would be as empty and uninformative as “Pleasure is pleasure” or “An unmarried man is a bachelor.” You would already know the answer just by knowing the words. But in real life, “Is pleasure good?” is a genuine, live question. It feels like you are asking something important. The question remains open — it hasn’t been closed by the meaning of the term.
Moore ran the same test for every natural candidate he could find. “What we desire to desire is good” — but is it? “What is highly evolved is good” — but is it? In each case, the question still made sense. He concluded that “good” cannot be identical to any natural property; it is a simple, unanalyzable property. You can’t break it down into smaller parts, just like you can’t explain what “yellow” is to someone who has never seen it.
Notice what Moore was not doing. He was not saying that pleasure or kindness are bad. He was saying that “good” and “pleasant” are two different concepts. A thing can be pleasant without being good, and maybe even good without being pleasant. The two properties can go together — but they are not secretly one thing.
Yellow, Beauty, and the Simple Good
If “good” isn’t definable in natural terms, then what is it? Moore was a non‑naturalist moral realist. That’s a mouthful, but it means two things. First, he was a realist: he thought moral judgments can be true or false, independent of what anyone believes or feels. Whether kindness is good doesn’t depend on whether you like it. Second, the property of goodness is non‑natural: it’s not the kind of thing science can measure, like weight or temperature. Goodness is its own kind of fact, distinct from all scientific or psychological facts.
How do we know what’s good? Moore’s answer was intuition. He didn’t mean a mysterious voice in your head. He meant that basic moral truths are not proved by gathering evidence or doing experiments. Instead, you reflect on a situation, think carefully, and simply see that it is good — just as you see that a painting is balanced or that a note is off-key. This kind of direct insight can be mistaken, of course; intuition for Moore wasn’t infallible. But it’s the foundation we have.
Moore himself applied this method to say what he thought the great intrinsic goods are — things that are good in themselves, not just useful for something else. In his book Principia Ethica (1903), he famously argued that the best things in life are aesthetic appreciation and personal love. By aesthetic appreciation he meant the admiring contemplation of beautiful things: listening to music, watching a sunset, reading a poem. Personal love meant deeply appreciating another person’s good qualities. He didn’t think the highest good was pleasure, or power, or even helping others in an active way. It was, as one of his friends later said, a vision of “timeless, passionate states of contemplation and communion.”
To test whether something is intrinsically good, Moore proposed a thought experiment we might call the isolation test. Imagine a universe that contains only one thing — say, a beautiful landscape with someone quietly enjoying it. Nothing else exists. Would that universe, on its own, be good? If your answer is yes, then you’re treating that combination as good in itself, not just as a tool for something else. Moore used questions like this to argue that beauty and loving relationships are worth having even if they never lead to anything further.
But Wait — Could Good Be Hidden, Like Water Is H₂O?
Moore’s open‑question argument convinced many people. But soon other philosophers pointed out a problem. They said: just because you can ask “Is pleasure good?” without sounding silly, that doesn’t mean the two things are really different. It might only mean that you don’t yet know their hidden identity.
Think about water. For thousands of years, people used the word “water” to mean the wet, life‑giving stuff in rivers and lakes. Scientists later discovered that water is actually H₂O. Yet no one would say that before the discovery the question “Is water H₂O?” was an empty tautology. It was informative because the concept “water” was of a stuff we recognized by its surface features, while its deep chemical nature was hidden. Moral terms, the objection runs, might work the same way. “Good” might pick out a complex natural property — maybe some particular chain of brain states — without us being fully aware of what it is. The open‑question argument, then, might only show that we haven’t finished our scientific homework; it doesn’t prove that “good” is a special non‑natural property.
Moore disagreed, and later defenders backed him up with this reply: the water‑and‑H₂O analogy doesn’t apply to goodness. When we discover that water is H₂O, we are discovering which underlying stuff fills a role — the role of explaining why the liquid in lakes behaves the way it does. Water is a “gap” property: we know it by a job description, and science fills the gap. But “good” doesn’t seem to be a gap property at all. To be good isn’t to play whatever role explains something else; it is just to be good. There’s no hidden job description waiting to be filled. So, the reply goes, the identity trick that works for natural kinds like water simply doesn’t work for value.
A related objection says Moore begged the question. He assumed from the start that a statement like “pleasure is good” is not just a definition. But a naturalist thinks it is a definition, even if it doesn’t feel obvious. Here Moore said that when we accept a real definition — like “a bachelor is an unmarried man” — we eventually see it as a tautology. But with “pleasure is good,” no amount of reflection makes us treat the two as identical. The gap never closes.
None of these debates have a winner everyone agrees on. But the very fact that Moore’s little question still makes people argue, over a century later, tells you it poked at something deep.
Why This Old Argument Still Shows Up in Your Life
Every time you argue with a friend about whether a rule is fair or a movie is good, you’re living inside Moore’s question. If “good” simply meant “pleasurable,” then the statement “That comedy was pleasurable but not good” would be a contradiction — like saying “She’s a sister but not a sibling.” But people say things like that all the time, and it feels meaningful. Moore gave philosophers a tool to notice when we’re smuggling in a definition without checking whether it fits.
His ideas also matter for big modern problems. If goodness really is a simple, non‑natural property that can’t be reduced to facts about brains or societies, then teaching an artificial intelligence to be “good” might be fundamentally different from teaching it to maximize some number — even a number like “total human happiness.” An AI could follow a happiness‑maximizing rule and still miss what makes something genuinely good, because “good” isn’t locked inside any measurement.
Philosophers today are still split. Some defend non‑naturalist realism, saying that there are moral truths that science will never touch. Others think the best reading of Moore’s open‑question argument supports expressivism: the view that when we say something is good, we aren’t describing a property at all — we’re expressing an attitude, like cheering for it. (Moore himself briefly flirted with a version of this, then returned to his earlier view.) And of course many naturalists think that, with enough neuroscience and psychology, we’ll eventually find a natural seat for “good” after all.
Moore’s most lasting gift wasn’t a final answer. It was a habit: when someone declares, “Goodness is really just X,” you remember to tilt your head and ask, with real curiosity, “But is X good?” That one simple questioning step keeps ethics alive.
Think about it
- If someone said “Being fair is good,” could you seriously ask “But is it good?” Why does that question feel strange in some cases but very real in others?
- Moore believed we just “see” that certain things, like appreciating beauty, are good. But what if two people “see” completely different things — one values art, the other only values money — and neither can point to a scientific fact to settle it? How would you figure out who is right?
- Suppose a highly intelligent robot always follows the rule “maximize what makes people smile.” Would you call that robot morally good? Why or why not?
