But what is a "concept"? To put it simply, human beings rely on "associations" to classify everything in the world into different "concepts". Stone A, Stone B and Stone C all have the same qualities, when the child sees Stone A for the first time, he remembers this experience in his mind, and when he sees Stone B, he will "remind" the Stone A he saw earlier, because Stone A and Stone B have similarities, and the child clings to these similarities, not that he does not see the differences between Stone A and Stone B, but that he focuses on the same place. When he sees Stone C again, he "thinks" of the similarities between Stone A, Stone B and Stone C. Now he can classify something, but it's just a thought, and at this point the "concept" has not yet arisen, because even if he sees thousands of different kinds of stones in his later experience, and sees the commonality of these thousands of stones, he can't describe what "stones" are, because he doesn't have the means to "describe" them. But he was clever enough to think of a way to "name", as long as he used a symbol or a syllable to represent the commonality of his observations of stones, then his vague idea of associating and classifying stones A, B and C, this unspeakable and inexplicable personal subconscious, was "named" and transformed into "consciousness". After using "association" to classify the common qualities of things, these common qualities become a thought, and this thought is the "personal subconscious", the so-called "subconscious" is that we understand something in our hearts, but we can't say why. I'm sure you've all tried some, some feelings, or some thoughts, but you haven't been able to put them into words.

Furthermore, you all have the same experience of thinking, when you think about a problem, you speak to yourself in your head, you think in words, and of course you can turn your thoughts into images. For example, when you eat, you have two ways of thinking, one is to say to yourself, "It's time to eat", and the other is to have an image of "a bowl of rice" in your mind. If you think about it in terms of images, the child who has seen tens of millions of stones, when he thinks of stones, he will only have one stone in his mind, but he does not realize that this image is already a comprehensive image of his summary of tens of millions of stones, so it can be said that the stone that appears in his mind is a "concept" prototype.

But in fact, the laws of the world and the universe are difficult to represent in a tangible image, and even if you can classify some abstract laws because of your own experience, how can you say this type of experience? The experience of some experiences that cannot be spoken, cannot be explained, and cannot be represented by images, is our "personal subconscious". Human beings invent some symbols or syllables to represent these experiences that are "unspeakable, unspeakable, and unrepresentable by images", which is "naming", but the experience of "unspeakable, unspeakable, and unrepresented by images" becomes an "abstract idea" even if it is given a "name". But don't forget, human beings don't have telepathy, even if I name this bunch of "abstract ideas" A, but my other friend or family member is so close that they won't have the same experience as me, or even if they encounter similar experiences, they will not understand that the name A represents a bunch of "abstract ideas" in my mind.

Taking "stones" as an example, Child A has seen 100 stones and classifies them as an image and names the image LA. In the same way, Child B looks at 100 stones, and even though the 100 stones are exactly the same as what Child A sees, when they are grouped into an image in their mind, the image in the mind of Child A and Child B will be roughly the same, but not exactly the same, and when Child B names the image YB. When Child A and Child B communicate verbally, one says LA and the other says YB, how do they know that they are actually describing the same thing? Therefore, even if the two sides have "spoken and written" to communicate, they still cannot communicate. But in fact, what is the key to human beings being able to use language to communicate?

The key is awareness. Human beings still use "naming" as the origin of "consciousness", that is, the light of our wisdom. However, the operation is a bit complicated, and in the human experience of "naming", it is not just "naming" a thing, but starting with "naming" something that can be seen and touched. Objective and real things, even if different people give different "propositions" to this thing, it is possible to unify this concept and achieve mutual understanding. When Child A and Child B communicate verbally, one says that the "stone" is LA and the other says YB, and everyone can't communicate, the easiest way is to find a stone and put it in front of the other person, then everyone has a consensus, maybe the two children decide that the "stone" is called CV. However, those similar experiences that are "unspeakable, inexplicable, and cannot be represented by images" should not be shown to everyone, so that everyone can have a consensus and jointly name this experience "Concept A". To solve this problem, it is still necessary to use the method of "association".

The further step of "association" is "imagination". For example, the abstract concept of "sadness" is something that everyone has experienced, and when I say the word "sad" now, you may associate the experience of "pain". If we are all primitive people who have just learned to "name" real things, and I have the feeling of "sad" now, I want to tell you, but because the feeling of "sad" is very abstract and even ethereal, although I have named the feeling of "sad" QQ, and you have already named the feeling of "sad" DD. But when we were communicating, I said QQ, and you said DD, which is simply "chicken and duck talking". So I came up with a way to go hunting, I went out hunting, I found the heart of an animal, put an arrow in front of you, and pointed to the position of your heart, and then pointed to the position of your heart, and then you thought about what it would feel if you stuck an arrow in your heart, and that was the feeling of "pain". With everyone being able to communicate, we will collectively name the feeling of "sadness" as "pain".

You may ask, did primitive man know what the heart is? They will know that they have the "heart" in their body, and they will also know where the "heart" grows. That's a good question, the above explanation is just an example, but this example is not about "association" but on "naming". When language and writing were first formed, human beings accumulated experience through "naming", and different groups of human beings used their own inductive methods to "name" objective things, which were initially things that could be seen and touched, because there were the least differences in them. Then there are some of the same experiences, such as the idea of "forward", where one person points to the "forward" to other people, and everyone understands and begins to "name" these thoughts together as YY. In the end, "naming" is "those who can't be said, can't be said, and can't be represented by images", and the method is to use the basis of the previous "naming", each "name" is a "concept", and use the "real concept" to describe the "abstract concept", just like the example of "sadness", which is to connect different "concepts" together through human "association", so that people from the same ethnic group can use "naming" and "association" to form their own language and writing system. The system of language and writing is actually composed of different "names". "Go" is a "name" representing a "concept", "to" + "front" + "go" = 3 "names" combined into a sentence, and the different combinations of these "names" will evolve into different sentences. Human knowledge is preserved beyond time and space by forming "sentences" and then "articles" from "names".