Yesterday I was considering philosophy as an activity whose aim is to consider the *significance* of things. The goal of philosophy would be to determine, not what is true, but how it is possible that any particular statement is true. This is obscure, so let's consider an example. That two and two are four is true -- no one will debate that. The philosophical question, then, would be, what makes it possible for two and two to be four? How *can* two and two be four? But what is the sense of this question? Suppose someone answers in this way: "You know how to count to four. But counting to four necessarily involves counting to two twice -- counting up to two, and then counting up to two again. I mean this: on one hand, count up. For each finger that you lift on that hand, lift up a finger on the other hand, until you get to two on that hand, and then start over. Now do that twice. When you've done, you'll have four fingers raised up on the first hand." Is this an answer to the question, how is it possible that two and two are four? It seems to me that I have been given a *method* for determining that two and two are four. If that's the case, then I can reply that I wasn't looking for a method. What I want to know is why two and two are four, rather than some other number. "But I just told you why! I told you to count in a certain way, and as a result it turns out that two and two are four." So is it that two and two are four because of counting? And why should counting make it the case that two and two are four, and not some other number? When I ask these further questions, you don't know what to say -- I take this as a sign that we have started to do philosophy. In virtue of what about counting is it that two and two are four? "How is it that counting makes it possible that two and two are four?" -- Well it's clear that counting *doesn't* make it possible for two and two to be four. Rather it must be because two and two are four that they come out to be four when you count. Counting doesn't make numbers possible, but it's rather the other way around. And what do I mean if I ask, how is it possible that two and two are four? I mean, why are they four and not some other number? But how could they be any other number? That two and two are four is as they say a necessary truth! And now what if I were to ask, what makes it possible for something to be necessary? Again, you might want to say -- it is not because things are possible that they are necessary -- if anything, it must be the other way around: possibility is possible only because of necessity! To say of necessity that it is possible must involve some kind of a mistake! And now we are in the philosophical realm: we have distinguished between the fact *that* two and two are four, the *method* whereby two and two are known to be four, and what I suppose one might call the *nature* of this fact, that it is necessary and not possible. And the question still arises, how can something be necessary? Only now I would suppose we are not asking how it is possible for it to be true that things are necessary. We come up against the "guiding word" in philosophical inquiry -- "why"? We don't ask, how is it possible that things are necessary, but rather -- why are things necessary? Whatever we mean by asking, why, we are not to explain this in terms of possibility. "Why are things necessary?" cannot not mean "How is it possible that things are necessary?" -- since this is an absurd question (though perhaps not in every context). Now if this is a real question at all -- if I've really traced out the beginnings of a philosophical inquiry, then we need to ask ourselves whether this question has anything to do with what I called significance. Does the question "Why are things necessary?" aim at the significance of necessity or something else? If it aims at the significance of necessity, then I suppose we must be asking, "What is it about the world that things are necessary?" -- or again, "How are things necessary?" -- and we begin to go around in circles! What might we be trying to determine? Are we trying to determine what makes necessity intelligible -- how it is that one is capable of understanding things *as* necessary? "No! For now we are going to be explaining necessity in terms of possibility. It is not the case that for something to be necessary is for it to be capable of being understood as necessary!" Further, if we answer in this way, it seems like we'll be in the same position as we were when we tried to say that two and two are four because that's what you get when you count them up. And it is not because of understanding that things are necessary, anymore than it is because of counting that two and two are four, but rather the other way around: because two and two are four, we are able to count them out; because of necessity, we can understand necessity. If there were no necessity -- if necessity were impossible! -- we could not understand necessity, because one cannot understand something that doesn't (in some way!) exist to be understood.
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