Isaiah Berlin: Why We Have to Choose

Imagine you have to choose between two things that are both really important, but you can’t have both. Maybe you have to decide between telling the truth and protecting a friend’s feelings. Or between being fair to everyone in a group project and letting your best friend do things their way. Or between studying for a test and going to a family event.

Most of the time, we assume there must be a right answer. If we just think hard enough, or find the right rule to follow, we can figure out what to do. Some problems are like that—math problems have one correct answer. But what if some of the most important questions in life don’t work that way? What if, when you’re choosing between two genuine goods—like freedom and fairness, or loyalty and honesty—there’s no single right answer? What if you just have to choose, and that’s what makes you human?

A philosopher named Isaiah Berlin spent his life thinking about this. And the answers he came up with are still being argued about today.

What Is Philosophy, Anyway?

Berlin had a particular idea of what philosophy was for. He didn’t think philosophy was like science, where you can run experiments and get answers. And he didn’t think it was like math, where you can prove things by following rules.

Instead, Berlin said philosophy deals with questions where nobody knows the right method for finding an answer. “What is time?” is a philosophical question. “How long does it take to drive from New York to Boston?” is not—you can just check the clock. “What is fairness?” is philosophical. “Who scored the most points in the game?” is not.

Philosophers, Berlin thought, study the “thought-spectacles” we all wear—the basic ideas we use to make sense of the world. Ideas like “freedom,” “truth,” “good,” “fairness.” Usually we don’t notice these ideas; they’re like the air we breathe. But sometimes they get tangled up, or they clash with each other, and we need to look at them directly. That’s when philosophy becomes important.

The Big Enemy: Monism

Berlin had an enemy. He called it “monism” (from the Greek word for “one”). Monism is the belief that:

Every real question has one true answer.
There’s a reliable way to find that answer.
All the true answers, when you collect them, will fit together into one perfect system.

You can see why this idea might be attractive. If monism were true, then eventually, once we figured things out enough, there would be no more serious disagreements. No more choosing between loyalty and honesty. No more trade-offs. Everything would harmonize.

Berlin thought this was not just wrong, but dangerous. He thought monism was behind some of the worst things people have done to each other. If you believe there’s one perfect way to live, one ideal society, one correct set of rules, then it becomes tempting to force other people to live that way—“for their own good,” of course. And if they resist, well, they must be ignorant or evil. You might even be justified in hurting them, since the perfect result will be worth it.

This sounds extreme, but Berlin saw it happening in his own lifetime. He was born in 1909 in what is now Latvia, lived through the Russian Revolution as a child, and later escaped to England. He watched as Communist leaders, convinced they had discovered the one true way to organize society, killed millions of people. He saw how Nazi Germany did something similar, for different reasons. Both were, in their own ways, monists. They believed they had The Answer, and anyone who disagreed was an obstacle to be removed.

The Alternative: Value Pluralism

Berlin’s central idea—the one he called his only genuine discovery—was “value pluralism.” This is the claim that there are many genuine values (like freedom, equality, justice, mercy, loyalty, truth, beauty, friendship, independence), and that these values can genuinely conflict with each other. When they do, there is no single right answer about which should win. You just have to choose.

This isn’t the same as saying “anything goes.” Berlin wasn’t a relativist. He didn’t think everyone’s values are equally good. Some values—like cruelty, or the desire to dominate others—are not genuine values at all. Berlin believed there’s a “human horizon,” a set of basic moral truths that all (sane) humans share. Slavery is wrong. Torture is wrong. Genocide is wrong. These aren’t matters of opinion.

But within that horizon, there’s real, unresolvable conflict. Consider these examples:

Freedom vs. Equality. A society where everyone is completely free to do whatever they want will quickly become unequal—the strong will dominate the weak. A society that’s perfectly equal will have to restrict people’s freedom. Both freedom and equality are genuine goods. You can’t have both completely. What’s the right balance? There’s no formula.
Justice vs. Mercy. A judge who is perfectly just would punish every crime exactly as it deserves. But sometimes mercy is the better thing—especially when the person has suffered enough already, or when the punishment would destroy them. Both are genuine values. Which wins?
Loyalty vs. Honesty. Your best friend asks if you think their terrible idea is good. Being honest might hurt them and damage your friendship. Being loyal might mean lying to support them. Both honesty and loyalty matter. There’s no rulebook.

Berlin said this isn’t a problem we can solve once and for all. It’s built into the fabric of human experience. “These collisions of values,” he wrote, “are of the essence of what they are and what we are.” A world without these conflicts wouldn’t be a perfect world—it wouldn’t be a human world at all.

The Big Question: Incommensurability

Here’s where it gets complicated. Berlin said values are not just different from each other; they are “incommensurable.” This is a fancy word that means they can’t be measured on the same scale.

Think of it this way: You can compare two books by asking which is longer (measuring by page count), or which is heavier (measuring by weight). Those are commensurable—you can use the same ruler for both. But can you compare two books by asking which is “better”? What would the ruler be? One book might be funnier; the other might be sadder and wiser. There’s no single scale for “betterness” that applies to both.

Berlin thought the same is true for values. You can’t say “freedom is worth exactly 7.3 units of goodness, and equality is worth 5.1, so freedom wins.” There’s no moral slide-rule. When you choose between freedom and equality, you’re not calculating—you’re deciding what kind of person you want to be, what kind of society you want to live in.

This leads to a difficult question: If values can’t be compared by any rational method, then how can we make choices at all? Doesn’t that mean all choices are just random preferences? Berlin’s answer was vague, which frustrates a lot of philosophers. He seemed to think that we have a kind of “moral sense”—like an eye that can see what fits and what doesn’t—that helps us decide in particular situations, even though we can’t write down general rules. This is unsatisfying if you want a tidy theory, but Berlin insisted that real life is messy, and pretending it’s tidy is the first step toward fanaticism.

Freedom: Two Kinds

Berlin’s most famous work is about liberty. He said there are two basic ways of thinking about freedom, and they lead to very different conclusions.

Negative freedom is “freedom from.” It’s the absence of interference by other people. If no one is stopping you from doing what you want, you’re negatively free. This is the kind of freedom that says: “Leave me alone. Don’t get in my way. Let me live my own life.”

Positive freedom is “freedom to.” It’s about being able to actually do what you want—not just being free from interference, but having the power, the resources, the education, the self-control to achieve your goals. Positive freedom asks: “What do I truly need to be free, and who or what might be blocking me from getting there?”

Berlin thought both kinds of freedom are genuine values. But he warned that positive freedom has a dark side. Here’s the danger: If you believe people have a “true self” that knows what’s really good for them, and that this true self might be different from their actual desires, then you can start saying things like: “You think you want to waste your life playing video games, but your true self wants to study philosophy. I’m going to force you to study, which is actually making you free.” This logic can be used to justify all kinds of control and oppression.

This might sound far-fetched, but Berlin saw it happening. Communist governments said they were “liberating” people by forcing them into collective farms. They claimed to know what people really needed better than people knew themselves. Berlin thought this was a monstrous deception. He wrote that the idea of positive liberty had been “twisted” into its opposite, used to justify tyranny in the name of freedom.

His conclusion was not that positive freedom is bad, but that we should be skeptical of anyone who claims to know what’s best for us. Negative freedom—the simple right to be left alone—is precious precisely because it protects us from people with grand plans for our improvement.

How Should We Live, Then?

Berlin didn’t give a neat answer to this. He wasn’t that kind of philosopher. But some themes run through his work.

First, be humble about what you know. Monism is tempting because it promises certainty. But Berlin thought certainty about moral and political questions was usually a mirage—and a dangerous one.

Second, pay attention to real people, not abstractions. Berlin was deeply influenced by a Russian thinker named Alexander Herzen, who wrote that we should never sacrifice living human beings for abstract ideals. “The goal of life is life itself,” Herzen said. Berlin agreed. He thought the worst things happen when people say, “I know we’re hurting people now, but it’s for the sake of a perfect future that will make it all worthwhile.” The future may never come; the suffering is real.

Third, accept that loss is inevitable. Pluralism means you can’t have everything good at once. Every choice involves giving something up. Berlin thought this was tragic—he didn’t pretend it was easy. But he also thought facing this honestly was better than pretending there’s a way to have it all.

Fourth, protect a space for individual choice. If values really are plural and often conflicting, then each person needs room to figure out their own balance. This is why Berlin was a liberal—someone who believes in protecting individual freedom, especially freedom of thought, speech, and lifestyle. Not because freedom is the only value, but because without it, there’s no room for the kind of choosing that makes a human life human.

What People Still Argue About

Berlin’s ideas are still being debated. Some philosophers argue that his pluralism actually undermines his liberalism. If values are genuinely incommensurable, they say, then maybe liberal values (like freedom and tolerance) aren’t better than other values (like obedience to authority or traditional community). Maybe pluralism leads to the conclusion that no political system is better than any other. Berlin himself didn’t think this, but he never fully explained why.

Others argue that Berlin’s pluralism is just relativism in disguise. If there’s no single right answer about how to live, doesn’t that mean all ways of life are equally valid? Berlin said no—remember the “human horizon” of basic shared values. But critics say this horizon is too vague to do any real work. Without a clear definition of what’s inside and outside the horizon, “pluralism” becomes an excuse for avoiding hard questions.

There’s also the problem of how to make choices in concrete situations. If values are incommensurable, and there’s no moral slide-rule, how do we actually decide what to do? Berlin’s answer—that we rely on a kind of “moral sense” or practical judgment—sounds nice, but some philosophers find it frustratingly vague. “Just trust your judgment” isn’t really a theory.

Why This Matters

Berlin’s ideas aren’t just academic puzzles. They show up in everyday life. Every time you feel torn between two things that both seem good, you’re experiencing value pluralism. Every time someone says “trust me, I know what’s best for you,” you might want to ask Berlin’s question: “How do you know?” Every time you choose to give something up in order to get something else, you’re living out the core insight: you can’t have everything.

The most important lesson might be this: Be suspicious of people who claim to have found The Answer. Whether it’s a political ideology, a religion, a strict set of rules, or a guru with a plan—any system that promises to resolve all conflicts and make everything simple is probably wrong, and probably dangerous. The world is more complicated than that. We are more complicated than that. Learning to live with uncertainty and conflict, without pretending they don’t exist—that might be what Berlin thought wisdom actually is.

Appendices

Key Terms

Term	What it does in this debate
Monism	The belief that all genuine questions have one right answer, and that all good things ultimately fit together into one perfect system
Value pluralism	The claim that there are many genuine values, that they can genuinely conflict, and that there’s no single right answer about which should win
Negative liberty	Freedom from interference by others; the right to be left alone
Positive liberty	Freedom to achieve one’s goals; the power and ability to live as one truly wants
Incommensurability	The idea that values can’t be measured on a single scale; there’s no “common currency” for comparing how important they are
The “human horizon”	The boundary of values and ways of life that are understandable to other humans; inside are genuine values, outside are things too alien or evil to count at all

Key People

Isaiah Berlin (1909–1997): A philosopher and historian of ideas born in Latvia, raised in Russia, educated in England. He watched the rise of communism and fascism, which made him deeply suspicious of anyone who claimed to have The Answer for how society should be organized.
Alexander Herzen (1812–1870): A Russian writer who influenced Berlin deeply. Herzen argued that we should never sacrifice living people for abstract ideals, and that “the goal of life is life itself.”

Things to Think About

Berlin says we need to choose between genuine values, and there’s no rulebook for doing so. But doesn’t this mean we can never criticize anyone’s choices? If your friend says they value cruelty and domination, can you really say they’re wrong? Berlin would say yes—those aren’t “genuine values” because they fall outside the human horizon. But who decides where the horizon is?
Berlin was a liberal who believed in protecting individual freedom. But what if a society freely decides it doesn’t value freedom—if a democracy votes to restrict free speech, for example? Does pluralism say that’s okay (since it’s just a different set of values being chosen) or not? Berlin never gave a clear answer.
If you take pluralism seriously, you have to accept that sometimes you will make the wrong choice, even when you’re picking between two good things. Maybe you should have chosen honesty over loyalty, or vice versa—and you won’t always know which was right. How do you live with that uncertainty?
Berlin warned against people who claim to know what’s best for you. But don’t parents, teachers, and coaches sometimes genuinely know better than you do? When is it okay for someone to make decisions for you, and when does it become the kind of dangerous “positive liberty” Berlin warned about?

Where This Shows Up

In political arguments. When people say “you can’t have both freedom and security,” they’re describing a value conflict. When they insist that their preferred solution is the only reasonable one, they’re being monists. Berlin’s ideas give you a way to notice when someone is oversimplifying a genuinely hard choice.
In discussions about culture and tradition. When someone says “that’s just their culture, we shouldn’t judge,” they’re being relativists. When someone says “our culture’s values are the only right ones,” they’re being monists. Pluralism offers a middle path: genuine values can be different across cultures, but some things are universally wrong.
In everyday moral dilemmas. Any time you’re torn between two things that both seem good and important, you’re experiencing the reality of value pluralism. Berlin’s work suggests that this isn’t a problem to be solved, but a condition to be lived with honestly.