Some remarks on Wittgenstein's private language argument (PLA) Much has been said in these posts about using words to refer to some inner experience; not that we cannot use words in this way, but that when we attach the meaning of a word exclusively to the private experience, to which no one else has access, then the use of the word becomes problematic. It is not an easy error to grasp. In fact, this is difficult to understand, and it is difficult to explain. However, understanding what Wittgenstein is saying does produce some enlightenment.
Another example Wittgenstein used to explain the problematic nature of associating meaning with the private inner thing, is the beetle in the box example (PI 293). It shows how associating meaning with the private inner thing, which is based on a misunderstanding of the “grammar of the expression,” in terms of “object and designation (PI 293)”, cannot gain a foothold.
“Now someone tells me that knows what pain is only from his own case!—Suppose everyone had a box with something in it: we call it a ‘beetle’. No one can look into anyone else’s box, and everyone says he knows what a beetle is only by looking at beetle.—Here it would be quite possible for everyone to have something different in his box. One might even imagine such a thing constantly changing.—But suppose the word ‘beetle’ had a use in these people’s language?—If so it would not be used as the name of a thing. The thing in the box has no place in the language-game at all; not even as a : for the box might even be empty.—No, one can ‘divide through’ by the thing in the box; it cancels out, whatever it is.
“That is to say: if we construe the grammar of the expression of sensation on the model of ‘object and designation’ the object drops out of consideration as irrelevant (PI 293).”
Again, keep in mind that the purpose of these paragraphs is to say something about the meaning of a word in relation to the “object and designation” model. And, what stands out about what Wittgenstein is saying, is that the object could literally be anything, any internal thing we could imagine. This thought experiment demonstrates that the language-game used in such a context would not be dependent, especially in terms of meaning, on the thing in the box. Thus, it would be irrelevant, again, irrelevant in terms of the “object and designation” model of meaning.
Let us continue with Wittgenstein’s thinking: “If you say he sees a private picture before him, which he is describing, you have still made an assumption about what he has before him. And that means that you can describe it or do describe it more closely. If you admit that you haven’t any notion what kind of thing it might be that he has before him—then what leads you into saying, in spite of that, that he has something before him? Isn’t it as if I were to say of someone: ‘He something. But I don’t know whether it is money, or debts, or an empty till (PI 294).’”
Even if you say that the inner thing is a kind of picture, you are still making an assumption with no content. There is no way to describe it, you cannot see inside the other person’s box, so it is an empty assumption. And, of course, if you admit, Wittgenstein says, that you have no notion of the thing in the box, then how is it that you want to say there is something there? Maybe you could respond, “Because I have these kinds of inner things.” Yes, there are these internal experiences going on, but none of us can observe these internal happenings, it is like the beetle in the box example. Does it then follow from this that we cannot talk about our internal experiences of pain, hope, joy, sadness, etc? Obviously we can talk about these things, we do it all the time. This then brings us back to the notion of how meaning does get a foothold.