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We can't always be wrong, because that implies that correct ideas are not expressible, which makes no sense.

I think there is a sense in which we cannot always be sure that we are right, as there's always some possibility that we are wrong, even if we think we are completely right. And if we are completely right, there is nothing that is "manifest" about that.

Let's say I open my fridge, and there is cheese there, I conclude "I have cheese in my fridge". I may be hallucinating, or wrong about the category of cheese, or it just appears like cheese, or whatever. In that sense I could potentially be wrong. However I find it silly to think that I am infinitely wrong in my assessment of where my food is, all the time. That's like saying that we don't know what happens after we die. We do in every single way in which we use the term "know".

I think this idea that we are always wrong needs a rephrase, such as "we could always consider how we could be wrong", or "there is nothing that justifies our true belief", or "we could and should always criticise", or "nothing exists outside of criticism" (as we picked 1+1 and not 1+2 for some critical reason). The rephrase leaves open the possibility of being right a lot, like about where your food is, because you just found it, while still leaving open the possibility that the cheese you just saw is actually your butter.