I'm very far behind in the reading on this thread, so sorry if someone has already responded to this.
David Gould said:
'David Gould is wearing a hat,' is not a metaphysical claim - I can reach up and check my head, people can come look et cetera.
I would like to clarify and say that when you "check" you are checking in the physical sense. So if one person makes a claim about something sensed with their eyes, then someone else can potentially "check" that claim by also using their eyes.
However, if someone makes a philosophical claim (even if it's about the physical), then we ideally will need to use philosophy to "check" that claim. We could probably agree if we are both present when you are claiming to be wearing the hat. But if you claimed to have worn a hat yesterday, and if you produce 100 or 1000 people who also claim to have seen you, then that is still no longer a physical claim that I can verify myself. It's sort of an odd distinction, but I find it to be rather significant. Although, despite not seeing you with a hat on, I would count your claim as evidence, the claims of the 100s of people you saw as evidence, any pictures as evidence, etc...
David Gould said:
In other words, a metaphysical - beyond the physical - claim is a claim we cannot use physical means to check.
Just to verify that we're on the same page. Hume argued that we couldn't actually verify whether or not natural laws could continue workign in the future as they have in the past. Sure we can check it a bunch of times and verify that it worked in those circumstances, but we can't actually "check" what will happen in the future until that future moment comes. So any scientific claim made about how something will react in the future then, by the way you're describing it, is in fact a metaphysical claim (if I'm understanding you correctly).
David Gould said:
Now, this does not mean that some physical claims are not difficult to check. But all physical claims are theoretically checkable.
Hmm... again, I wouldn't have any way of checking whether or not you actually had a hat on. At best I can take your word on it, look at pictures and expect them to not be doctored, listen to others backing your claim, etc... So I do agree that many claims of the physical are checkable in that sense, they aren't necessarily checkable in the physical sense.
David Gould said:
This does not mean we can have proof of every claim, either - proof is only available in logic and mathematics.
The scientific method works on evidence - in other words, I can use evidence to determine whether I have a hat on my head or not. Or, indeed, to determine whether George Washington existed or not.
I'm not sure that the scientific method is necessarilly all that helpful in determining whether or not George Washington existed or not. Nor do I think it helps me in determining whether or not you had a hat on.
David Gould said:
With metaphysical claims, there is no evidence - it is not possible to gather evidence about whether or not hell exists, for example, or which particular rules see you end up there.
I'm still having a hard time distinguishing exactly how you're categorizing what is metaphysical and physical. If the only evidence I have about you wearing a hat is something I read on the internet and we're going to count that as evidence, then surely we're going to count anyone's claim about anything on the internet as evidence as well. The problem then becomes making sure the claims don't contradict.
As far as I can tell, you're claim that you had a hat on may be just as valid as Jesus's claim that there's a hell, that he's the son of God, and so forth. We still seem to be left with using inductive reasoning as to trying to determine what we believe to be the truth.
David Gould said:
However, I am not asking about why we believe certain things.
I am asking about whether there is a methodology that we could, in theory, use to determine the truth or otherwise of these claims.
With regard to physical claims, there is - the scientific method, backed up by logic.
With regard to metaphysical claims, is there such a method?
Maybe you can explain to me how we can use the scientific method to determine whether on a certain date and time that you wore a hat. I guess that's just where I'm getting hung up at.
David Gould said:
Again, it is not really about why you personally believe - although, to be honest, it sounds to me like you are saying, 'It feels to me as though it is true.'
The difference is I think I'm hearing you sort of exalting the scientific method or claims about the physical as if we can know them to be true because they're claims about the physical, whereas with other claims we can't know them to be true because they're not within the realm of the physical. My problem is that nearly all claims made about the physical are not physically verifiable in the sense you seem to be saying. So in short we really are left with using inductive reasoning. So without proof or omniscience, it basically does boil down to saying, "It feels to me as though it is true".
David Gould said:
It is about what methodology I, who have no feeling about these two claims either way, could test them to determine which one is true (or, at least, more likely to be true.)
And ignore the fact that they are about Hell - I should have chosen two different examples, as that is not what this question is about.
My claim is that I use the same method of inductive reasoning on both. If Bob claims X and Adam claims not X, then I would ask myself whether or not X is consistent with the rest of the facts of the world that I beleive to be true. I would want to verify whether or not Bob has a history of being honest, whether or not one of them appears to be motivated to gain something by their claim, whether someone asked them to claim that or if they did their own research, etc...
I can understand the whole physically verifying something... the problem is I think we, as people, only have physically verified about 1% of all that we believe to be true. And there's the issue that senses aren't necessarily reliable. For example, have you ever witnessed a car accident with some of your friends. Then later when recalling the story you remember some detail differently then the other 4? In that case it's not usually reliable to rely on your own senses but instead to go with the popular opinion of what happened. For all things I think it's best to be consistent with how we approach discovering the truth. And as such I don't feel like the approach I take is different for claims about hell then for claims about whether or not you are wearing a hat.