The previous piece argued that public conversation has gotten harder for structural reasons — fragmented information, attention-driven incentives, algorithms that sort us into rooms with people who already agree. That diagnosis sets up a question. What is genuine public conversation actually for? And what conditions does it need to work?

Plenty of thinkers have worked on these questions. None more carefully than the German philosopher Jürgen Habermas, who died in March at ninety-six. Habermas spent sixty years developing a theory of how democracies generate legitimacy through conversation — and what happens when the conditions for that conversation break down. His writing is dense, sometimes maddeningly so, but the core ideas are not hard once they’re stated plainly. They are also more useful, in this moment, than they have been at any time since he started writing.

This piece introduces three of his ideas: the public sphere, communicative action, and what he called the telos — the built-in purpose — of speech.

The public sphere is the easiest of the three to picture. Habermas drew it from history.

In his first major book, The Structural Transformation of the Public Sphere (1962), he traced how a particular kind of social space emerged in eighteenth-century Europe. Coffeehouses. Salons. Reading societies. Pamphlet wars. Ordinary people, increasingly literate, began to debate the affairs of state. The conversations sat between the state and the household — a public space where private people came together to exchange views and form judgments. Those judgments, taken together, came to be called public opinion.

Habermas was honest about the limits of his picture. The eighteenth-century public sphere was small and exclusive — almost entirely male, weighted toward property owners, leaving out most of the people whose lives it affected. It was an ideal type, never fully realized. But the ideal was meaningful. It described a way of organizing collective reasoning that did not depend on royal decree or military force. People assembled, talked, listened, and arrived at views that could then bear on what their society actually did. That arrangement, Habermas argued, is one of the conditions under which democracy is possible at all.

The second idea — communicative action — takes a little more effort, but it pays off.

Communicative action is Habermas’s term for what people do when they use language to genuinely understand each other. He set it against what he called strategic action: language used to manipulate, to threaten, to pressure, to perform. The difference is not subtle.

Consider two examples. A political ad designed to make voters afraid of the other candidate is strategic action. The speaker is trying to move the listener — toward fear, toward a vote, toward whatever the campaign needs that day. The listener is treated as an outcome rather than a person.

Now imagine a scientist explaining a study to a curious neighbor. The scientist wants the neighbor to understand the work. The neighbor wants to understand it. If the neighbor objects, the scientist takes the objection seriously. If the scientist’s reasoning is sound, the neighbor adjusts. They are reasoning together. That, on a good day, is communicative action.

Most political speech sits somewhere between the two. But the distinction is real, and people can usually tell which one is happening to them, even when they cannot articulate why. The discomfort of being talked at instead of with is the experience of strategic action being run on a person who was hoping for the other thing.

Habermas’s claim is that communicative action is what produces real shared judgment. Strategic action can produce compliance — votes, sales, the kind of agreement people give when they’re under pressure. Only communicative action can produce a public that has actually thought something through together.

The third idea is the most fundamental, and it is the one most worth defending now.

Habermas argued that human speech has a telos. The word is Greek and it means end or purpose — not in the sense of a goal a particular speaker happens to have, but in the sense of a purpose built into the thing itself. The way one might say the telos of a heart is to pump blood. A heart can also be transplanted, painted on a Valentine, or held in someone’s hand. But pumping blood is what hearts are for.

The telos of speech, Habermas argued, is reaching understanding. Whatever else we use language for, underneath every use is a structure oriented toward agreement based on reasons. When you say something to someone, you’re tacitly promising you have a reason for saying it. The listener, in turn, is tacitly weighing whether to accept it on the merits. Without those tacit promises, language stops being language and becomes a sequence of noises directed at a target.

This is doing a lot of work. The standard for good public conversation comes from the structure of speech itself; it doesn’t depend on any particular tradition or culture. That’s why conversations conducted in bad faith feel wrong even to people who disagree about everything else. And it’s why a public sphere that has stopped rewarding good-faith argument is operating against the grain of what speech is for.

Habermas was no sentimentalist about any of this. He knew real conversations are rarely as clean as his theory describes. People posture. They talk past each other. They mistake their interests for their reasons. They get tired and give up. He acknowledged all of it. His point was that the standard exists anyway — and that a society that loses the ability to come closer to it, even imperfectly, is losing something it cannot easily replace.

The diagnosis in the previous piece can be restated in his terms.

The structural conditions of our moment have made strategic action cheap and communicative action expensive. The architecture of online discourse rewards the first and punishes the second. Over time, this changes who shows up to talk, what they say, and what they expect from people on the other side. The result is a public that has not stopped speaking, but has largely stopped doing what speech is for.

What Habermas leaves us with is a clearer picture of what we have and what we are losing. The picture matters because it tells us where to look. The repair work, if there is to be any, will happen wherever people can convene under different conditions — small enough rooms and careful enough commitments to do, in good company, what speech is for.