Author: George Berkeley
_George Berkeley_
Reading time: 17 minutes
Synopsis
A Treatise Concerning the Principles of Human Knowledge (1710) shares a new and surprising idea: the world is not made of matter. Instead, it says the real world only exists if someone is thinking about it or seeing it. Berkeley believes that what we usually call “matter” is actually a collection of things we see, hear, or feel. God puts these together for us. This helps to close the distance between how things look and how they really are. It also helps against doubts about what is real. Berkeley says that objects exist because we sense them. This makes our knowledge more certain. It also shows that God is always directly present.
What’s in it for me? Think about what the world around you is really made of.
Imagine for a moment that you’re holding an apple. You see its bright red skin, you feel its cool, smooth surface, and you taste its sharp, sweet flavor. Now, ask yourself: What is the apple, really?
To most people, the answer is clear. The apple is a solid, real object, made of matter. It exists “out there” in the world, whether you’re looking at it or not. But in 1710, a young Irish philosopher named George Berkeley published a book that changed this common idea completely. He said that the apple – and everything else in the world – is not made of matter. Instead, it is only made of ideas.
Berkeley’s A Treatise Concerning the Principles of Human Knowledge is one of the most important and surprising books in the history of philosophy. It makes us rethink how we understand what is real. Its main idea is in a famous Latin phrase: Esse est percipi – to be is to be perceived.
In this Blink, we’re going to look closely at Berkeley’s surprising idea. We’ll explore why he thought the idea of matter was wrong. We’ll also see how he believed our senses really work. And we’ll find out why he felt that saying there is no physical world was the only way to truly show that God exists. By the end, you might find that the “solid” world around you does not seem so fixed or lasting – and your own mind seems much more powerful.
Blink 1 – Unclear ideas
Before Berkeley could build his new world of ideas, he had to remove old, unclear ideas in philosophy. He noticed a strange situation: philosophers, who spend their lives looking for truth, often end up more confused and unsure than normal people.
Why does the simple person feel sure about the world, while the scholar is full of doubts? Berkeley’s answer was simple: “We have first raised a dust, and then complain we cannot see.”
He said the problem was the idea of abstract ideas. Philosophers of his time, like John Locke, believed the human mind had a special power to take away small details to find big, general ideas. For example, they claimed you could imagine “color” without thinking of red, blue, or green. Just color in general. Or an idea of “man” that is not tall or short, not light or dark.
Berkeley said this was wrong. Try it yourself. Close your eyes and try to imagine a triangle that isn’t made of equal sides, two equal sides, or all different sides. You can’t. Any triangle you imagine must have a specific shape. Berkeley argued that abstract ideas are actually impossible for us to think of. They are like empty words. We give names to groups of things. Then we wrongly think these names mean some hidden, general thing.
This might seem like a small detail, but for Berkeley, it was the main cause of all mistakes. By believing in abstract ideas, philosophers thought they could imagine things existing without anyone seeing them. They started to believe that objects could have an existence that was not specific and did not depend on any mind.
Berkeley’s first mission was to make knowledge based on real, specific experiences again. If you can’t perceive something or imagine it in a specific form, he argued, it simply isn’t a part of human knowledge. By removing these false, general ideas, he prepared the ground for his most famous discovery: the objects we see and touch are only things we feel or sense.
Blink 2 – To be is to be perceived
Let’s go back to that apple. When you think about what you know about it, what do you actually find? You find a certain color, a certain smell, a certain hardness. These are all what Berkeley calls ideas.
Think about it: can a color exist without being seen? Can a sound exist without being heard? Can a pain exist without being felt? To Berkeley, the answer is a clear no. A color that no one sees cannot exist. So since the apple is just a group of these qualities that are seen or felt, the apple itself can’t exist without a mind to perceive it.
This is the main point of Berkeley’s idea that there is no matter. He isn’t saying that the apple isn’t real. He’s saying that it is real because it is perceived. Its Esse is Percipi.
For Berkeley, there are only two types of things in the universe.
The first are ideas. These are inactive. They are the things we perceive – colors, sounds, how things feel, memories, and emotions. They have no power of their own; they just are.
The second are spirits or minds. These do things. A spirit is the thing that perceives, thinks, and decides to do things. You are a spirit.
Most people believe in a third type of thing: matter. They think matter is stuff that exists outside our minds and holds up the ideas we see. But Berkeley points out a very big problem: if matter cannot think and is not perceived by anyone, how can we know anything about it at all?
If we can only know things through our senses – which provide ideas – and matter is by its nature, not an idea, then matter is truly impossible to know. Berkeley argued that we should stop looking for this invisible thing that is not useful. Instead, we should accept the world for what it actually is: a bright and beautiful world of ideas given by God.
Blink 3 – Why ‘main qualities’ don’t work
In Berkeley’s day, many scientists and philosophers tried to find a middle ground. They agreed that ‘secondary qualities’ like color, taste, and smell might only be in our minds. But they believed that ‘primary qualities’ – like size, shape, and movement – truly belonged to objects made of matter.
They argued that while the sweetness of a sugar cube might be a feeling only in our minds, its squareness was a real fact about the matter itself.
Berkeley shows this difference is wrong with a smart idea: you can’t perceive a primary quality without a secondary one. Try to imagine a square that has no color and no texture. You can’t. Shape and size are always “clothed” in color or touch. If the secondary qualities (the ‘clothes’) are only in our minds, then the primary qualities (the ‘body’) must also be in our minds.
Another reason is that primary qualities are also only in our minds, just like secondary ones. Think about a snowflake. To you, it’s tiny. But to a very small living thing, it is a huge, wide land. Which size is the real one? If the size changes depending on who is perceiving it, then size can’t be a natural part of an object made of matter. It must be an idea that depends on who is thinking about it.
By breaking down the barrier between primary and secondary qualities, Berkeley showed that the whole physical world is inside our minds. He showed that if we trust our senses, we must accept that everything – from the hugeness of the stars to the weight of a stone – is an Idea perceived by a Spirit.
Blink 4 – God, the Creator
If the world is just ideas in our minds, a worrying question comes up: Does the tree in the forest disappear when no one is there to see it? Do your furniture and your house vanish the moment you close your eyes or go to sleep?
For someone who doubts everything, this leads to a bad idea called solipsism – the belief that only your own mind exists. But Berkeley was not a solipsist. He pointed out a very important fact: we don’t choose most of our ideas.
When you open your eyes in the morning, you don’t make the sun bright or the grass green. These ideas come to you very clearly and in a regular way. Your own mind cannot create them so strongly or regularly. If you’re not creating the world, and there’s no matter to create it, then who is?
Berkeley’s answer: God.
For Berkeley, the Laws of Nature are simply the regular ways in which God speaks to our spirits. God is the main perceiver who keeps the entire universe real. The tree doesn’t disappear when you leave the forest because God is always perceiving it.
This changes what science is really for. Instead of trying to discover how matter moves, Berkeley argues that scientists are actually understanding God’s messages. When we see a flash of lightning followed by a roar of thunder, we’re not seeing “physical causes”; we’re seeing a regular order of ideas that God uses to teach us how to understand and live in the world.
In Berkeley’s view, his own philosophy wasn’t saying reality is not real – it was a way to show that God is always directly here and that we cannot deny it. If the very world you see is a direct message from God’s mind to yours, then God is close to every one of us.
Blink 5 – No more doubt
One of the most surprising things Berkeley says is that his idea that there is no matter actually wins against the arguments of people who doubt everything (Skeptics), and saves our normal way of thinking.
Skeptics at that time said that our senses only show us pictures of things. So, we can never be sure if a real world exists behind those pictures. We see a red picture, but we might not know, the real object could be a gray blob or not exist at all. In this view, we can never truly know reality; we only know a copy of it in our minds. We’re like people looking at a movie screen, wondering if there’s actually a world outside the theater.
Berkeley’s solution was to remove the screen. If the image is actually all there is, then there is no space left for doubts to enter. If the “real” apple is exactly what you see and feel, then you can be completely sure that the apple exists. You don’t have to worry about whether your ideas are like some matter that you cannot see, because there is no invisible matter to match.
This philosophy also solved many difficult scientific and math problems of the eighteenth century. For example, mathematicians were having trouble with the idea that you can divide something forever – the idea that you can keep dividing a piece of matter into smaller and smaller parts, without end.
Berkeley argued that since an object is an idea, it’s only as divided as you can see it to be. If you’re not perceiving a millionth part of a grain of sand, then it doesn’t exist. By connecting reality to what we perceive, he changed confusing, endless ideas into a world that was understandable to us.
Blink 6 – Living in the world of ideas
At this point, you might be thinking: Fine, Berkeley. But if I walk into a wall, it’s still going to hurt. Does calling it an “Idea” change anything?
Berkeley would agree with you. He wasn’t suggesting we change how we live. He famously said we should “think like wise people, but talk like common people.” We can still say the sun rises and the fire is hot, even if we know that from a science and philosophy point of view, those are just descriptions of changing ideas.
The real change is inside you. When you stop seeing the world as a cold, lifeless machine made of matter, and start seeing it as a lively system of ideas, the way you see reality changes.
You begin to realize that the beauty of a sunset or the complicated structure of a living cell isn’t a random event of physics. It’s a meaningful experience. You also realize that your spirit – your conscious self – is the most basic and important thing in the universe. You’re not a small part of a world made of matter; rather, the world is a specially arranged experience happening inside minds like yours.
Berkeley’s Treatise asks you to be more aware of what you experience. It makes you stop assuming the solid world is just there and to see how wonderful it is that we can perceive things. Every time you see a friend, hear a song, or feel the wind, you’re participating in a big conversation in your mind.
Final summary
The main idea of this Blink to A Treatise Concerning the Principles of Human Knowledge by George Berkeley is that the idea of matter is a confusing, general idea that causes wrong thoughts. By realizing that something only exists if it is perceived, we understand that the world is made only of ideas and the minds that see them. This way of thinking takes away the difference between how things seem and how they truly are. It makes our knowledge based on sure experiences. It also shows the physical world as a constant, well-ordered message from God to our minds.
Instead of a universe of cold, lifeless material, Berkeley presents us with a world that is at its core, mental, and deeply linked to our own awareness. It’s a philosophy that asks you to believe what your senses tell you, to value your spirit, and to see God in everything you experience every day.
Okay, that’s it for this Blink. We hope you enjoyed it. If you can, please take the time to leave us a rating – we always appreciate your feedback. See you in the next Blink.
Source: https://www.blinkist.com/https://www.blinkist.com/en/books/principles-of-human-knowledge-en