Some remarks on Wittgenstein's private language argument (PLA) Saying some of the same things again, from a slightly different angle.
If Wittgenstein is correct about meaning, viz., that it’s a rule-based use that happens in social settings, then it’s an error to think that one’s use of know is based on some internal mechanism of the mind. In other words, the association of the word know with some internal or subjective mechanism gives us the false idea that we have privileged internal access to knowledge. This idea removes the concept know from its social foundation where its meaning, again, is derived.
Wittgenstein asks the following question in PI 243, “…could we imagine a language in which a person could write down or give vocal expression to his inner experiences—his feelings, moods, and the rest—for his private use?” He’s not asking if we can use the language that we’re familiar with, to write down our private feeling, moods, etc., obviously we are able to do this. He’s asking if we can use words “…to refer to what can only be known to the person speaking; to his immediate private sensations.” So, the person in this example is using a completely private language, to refer to his/her private sensations. Remember, no one else understands the language of this person, it’s completely devoid of any social context.
Next, Wittgenstein asks, “In what sense are my sensations private?—Well, only I can know whether I am really in pain; another person can only surmise it.—In one way this is wrong, and in another nonsense (PI 246).” It’s wrong to think that people “surmise” you’re in pain, as if they have to guess it, i.e., they see your screams of agony, or they see your injury - it’s not a matter of surmising. Of course, someone could be faking their pain, or lying, but generally it’s true that for the most part we know when someone is in pain. Wittgenstein’s interlocuter asks, “Yes, but all the same not with the certainty with which I know it myself (PI 246)!” It’s here that we get to the crux of the matter, for what could such a statement mean? Do I discover or learn that I’m in pain? Having knowledge, or the process of knowing, is a process of discovery. Again, do I discover that I’m in pain, or learn that I’m in pain? This seems to be, and is, nonsense. Wittgenstein asks, “It can’t be said of me at all (except perhaps as a joke) that I know I am in pain. What is it supposed to mean—except perhaps that I am in pain (PI 246)?” The adding of the word know is meaningless in this situation. It’s as if you’re discovering your own awareness, “Oh, I’m in pain, gee, I didn’t know that until just this moment.”
Could you be in pain and not know it, then somehow discover it? The closer we look at these kinds of statements, the more nonsensical they become. We need to ask, “What would it mean to not know I’m in pain?” One of the ways to understand the use of the word know, is to consider its negation, again, “I don’t know I’m in pain.” Knowing and not knowing have to be seen in juxtaposition. This seems to be why “I know I’m in pain,” amounts to no more than, “I’m in pain.” Why? Because there is no not knowing I’m in pain. I’m either aware of my pain, or I’m not aware. It’s part of being conscious.