You Don't Need a Predicate to Make a Judgment: Brentano's Big Idea
A Red Tree and a Question Without Words
Imagine you’re staring out the window on a lazy afternoon. A thought crosses your mind: Are there any red trees? You don’t say it aloud. You don’t even form a full sentence inside your head. You just call up the idea of a tree and the idea of red, and you hold them together, wondering whether they really belong together in the world.
Now, have you made a judgment? Most philosophers before Franz Brentano (1838–1917) would have said no. They thought a judgment always means combining two ideas—like a subject and a predicate—into a statement such as “Some trees are red.” Brentano disagreed. He spent his life arguing that the moment you simply accept or reject something as real, you’ve already judged. You don’t need words. You don’t need a predicate. You just need an object and a mental act of acknowledging or rejecting it. That seemingly tiny move forced thinkers to rebuild logic from the ground up.
The Battle Between Thinking and Judging
Why did Brentano believe judging is so different from just thinking? He looked closely at the mind’s furniture and found three possible answers, then shot each one down.
First, maybe the difference is extrinsic—like the difference between a bachelor and a husband. A husband has the relational property of being married; a bachelor lacks it. Could judging be a mere presentation with an extra “disposition to act”? No, Brentano argued. Dispositions rest on deeper categorical properties. If judging were just thinking-plus-a-disposition, the difference would still bubble up from something intrinsic, not just a label.
Second, maybe the difference lies in the content. When you think “red tree,” your mind presents a combination of marks. When you judge “There is a red tree,” does the content change? Brentano said no: the same two marks—redness and treehood—appear in both acts. You can present a red tree without believing in it. Content can’t be what separates them.
Third, maybe a judgment is simply a stronger, more vivid presentation. Think of it like turning up the volume on a thought until it becomes a belief. Brentano rejected that too. Strength doesn’t make sense across two different kinds of act. Seeing something vividly doesn’t automatically make you judge it exists. And there’s no single “strength” dial that turns a presentation into a judgment.
So Brentano concluded that judgment is a fundamental mental phenomenon, not built out of anything else. He called the act of saying “yes” to an object acknowledgment (anerkennen) and the act of saying “no” rejection. These are as basic as seeing colors or feeling hungry—they can’t be reduced to simpler parts.
The Secret Code of “Exists”
If judging is just a mental yes or no, what about the word “exists”? Many philosophers treated “exists” as a predicate, like “red” or “tall.” They’d say “God exists” predicates the property existence of God. Brentano thought this was a colossal mistake.
He found allies in history. Aristotle (384–322 BC) had hinted that some truths involve a direct “touching” of things, not a combination of ideas. Thomas Aquinas (1225–1274) said that in “God exists,” the word “is” is not a real predicate but a sign of affirmation. Immanuel Kant (1724–1804) claimed being is not a real predicate at all—it adds nothing to the concept of a thing. Brentano read these hints and gave them a psychological backbone: when you judge “A exists,” you don’t silently say “A has the property of existence.” You simply acknowledge A. That’s it. The word “exists” in language is just a force-marker, like the period at the end of a sentence. It tells you a yes-mode is on.
This opens up a powerful move. Brentano argued that existential judgments—judgments of the form “A exists” or “A does not exist”—are the most basic kind. Every perception, he said, is a judgment of this sort. When you see a yellow canary, you don’t predicate yellowness and birdness and existence on some object. You simply acknowledge the canary-presented-to-you. The dog chasing it does the same thing, without ever forming a proposition. And that dog is judging, too.
So Brentano’s big idea stands: predication is one thing, judgment is another. You can judge without saying “is.”
Rewriting Logic with a Single Sweep
Now comes the really audacious part. Brentano claimed that all judgments can be squeezed into the existential form. Statements like “All humans are mortal,” “No stone is alive,” “Some apples are green,” “Some dogs are not brown”—the classic four corners of traditional logic—can be rewritten without changing their meaning:
- “All S are P” means the same as “An S that is not P does not exist.”
- “No S is P” means the same as “An S that is P does not exist.”
- “Some S are P” means the same as “An S that is P exists.”
- “Some S are not P” means the same as “An S that is not P exists.”
This reduction thesis turned the logic textbook upside down. Traditional logic taught that universal statements (All, No) imply the existence of their subjects, and that particular statements (Some) contradict universals. Brentano showed that when you translate everything into existence talk, the square of opposition loses half its rules. “All S are P” and “No S are P” don’t imply that any S exists. They are negative judgments—they reject the existence of a certain combination. So you can say “All unicorns are white” without believing any unicorns exist. The sentence is just a way of saying “A unicorn that is not white does not exist.” Because there are no unicorns at all, that judgment is safe.
This cleaned up logic dramatically. But Brentano’s deeper aim was to reveal that language disguises the true nature of our judgments. When you say “Some swans are black,” you seem to be making a positive claim about a group of things. In your mind, according to Brentano, you’re really just acknowledging a particular object: a black-swan combination. You’ve affirmed its existence. The subject-predicate grammar is a costume.
The Double Judgment: Why Brentano Changed His Mind
Then Brentano did something remarkable: he admitted he’d been partly wrong. In later writings, he realized his reduction thesis couldn’t cover every case without smuggling in fake objects.
The problem was negative properties. If you say “Some S is not P,” Brentano’s old analysis had you affirming “an S that is not P.” But “not-P” looks like a negative property—a ghostly entity like non-whiteness. Brentano hated that. He thought there are no negative properties in reality; negation belongs to the way we judge, not to the content we judge about.
His solution was a new, more complex structure: the double judgment. Take “This rose is a flower.” First, you acknowledge the rose (an existential yes). Then, without losing that yes, you identify the idea of a flower with the rose you’ve already accepted, and you acknowledge the rose-identified-with-flower. So you make two judgments in one breath. The second one cannot exist without the first; you have to accept the rose before you can accept it as a flower.
The negative case works similarly. “Some dogs are not brown” begins with acknowledging a dog, then rejecting the identification of brown with that dog. The “not” now lives in the mode of the second judgment, not in a spooky negative property.
This move collapsed Brentano’s dream of a perfectly uniform theory. He now had to admit there are simple existential judgments (like perceiving a canary) and double judgments (categorical statements). Even language hid a further trick: “All S are P” he re-analyzed as a meta-judgment about someone who judges “An S is not P”—you’re saying that person judges incorrectly. The reduction of everything to one existential form was gone. But the core insight survived: the mind’s basic acts are accepting and rejecting objects, not tying words together.
Why Brentano Still Matters to You
Why should a twelve-year-old care about a 19th-century psychologist? Because Brentano’s idea touches something you do every waking moment. Next time you hear a noise outside and instantly think A car, without forming the sentence “A car exists,” you’re making an existential judgment. When you see your friend across the playground and simply recognize her—no silent label needed—you’re acknowledging an object. Your mind says yes to a presence.
Brentano forces us to ask: Is truth something that belongs to sentences, or something that belongs to the mind’s gestures of acceptance and rejection? If a dog can judge, does truth need language? And when you say “No one is perfect,” are you really making a claim about a missing imperfect person, or are you doing something more subtle with your own mental acts?
He also hands you a quiet superpower: noticing when your brain is doing the acknowledging and when it’s just presenting. Holding an idea in mind without accepting it—considering “there is a tenth planet” or “ghosts exist”—is a skill philosophers prize. Brentano built a whole theory to show that the line between wondering and believing is not about more words. It’s about a fundamental shift that can happen in a flash, long before you open your mouth.
Think about it
- When you see a bird land on a windowsill, do you think you are making a judgment that it exists—or are you simply seeing it, and the judgment comes later? How would you test the difference?
- If you can accept or reject an object without using words in your head, does that change what it means for a belief to be true? Could a dog ever have a true belief?
- Brentano said that “No S is P” is basically saying that a person who judges “An S is P” judges falsely. Can you think of an everyday sentence you use that might secretly be about someone else’s judgment?
