You are ignoring a temporal aspect of this. Usually you have a hypothesis and test it against reality, once you’re satisfied it’s at least true for all conditions you thought or knew to test, perhaps make a prediction and test that, you can probably go from calling it a hypothesis to calling it a theory since you think it models reality. However at some later time you may realise that your theory doesn’t hold for a certain condition found in reality, at which point you have to either adjust or discard your theory based on your observation of reality. Nobody said that to be called a “theory” (there’s a clue in the name), it has to be an absolute representation of objective reality. To put this crudely, it’s merely our current opinion of how reality operates, and is absolutely open to being INaccurate and subject to revision. Usually theories are simply “the best we’ve got”, and can’t always tell us WHY something is so. Just that it is so.
My brother once said to me ‘It is true in theory but not in practice’ I nearly fell of my seat.
This is usually a nice way of saying “No the world doesn’t work the way you think brother”. What people mean by this is, if I suspend reality for a moment, and only take into account the conditions you’ve created in your theoretical context, then logically I can deduce that your assertion is true. But if we bust open that closed system you’ve created and let in the real world, with all kinds of complex interaction so numerous that our minds just cannot contemplate them… then it’s possible to not be true.
I mean, in theory, I’ll be sitting here tomorrow morning. In practise I could die in my sleep tonight from a satellite falling through my roof and I won’t be sitting here. Thus the theory explains what I expect to happen. And if I’m here tomorrow it’ll hold. But the real world is more complex and there’s no way for me to account for everything that could happen in the next 24h. Thus the reality MAY not match the theory, but probably will. That doesn’t mean it’s a shitty theory; in all likelihood I will be here and the theory is sound. If you take into account the trillions and trillions of interactions of matter happening in and around you every second… you should realise it is fundamentally impossible to accurately model reality. Some illustrate this with Gödel’s incompleteness theorem. To accurately (as in absolutely) model reality you’d need all the matter in the universe to store the information about all the matter in the universe. It’s impossible to model a system completely from within that system.
This ‘brain in the vat’ thought experiment is interesting but is not based in reality.
You can’t prove that assertion any more than I can. Think about this. Suspend your disbelief for a second and just imagine… you are a brain in a vat. You have no clue that you are a brain in a vat, everything you experience is a simulation. How would you prove you aren’t one? You presuppose the argument is invalid because it’s not “part of reality”, but the entire point of the conversation is that “reality” may be an illusion, and you have no way of knowing. None, zero, zip. You can’t invalidate a statement about the nature of reality by using the rules of that same reality. If those rules are an illusion, so is your argument!
well I do not think it would happen any time soon.
Well that’s subject to your interpretation of “soon”. Brains of rats are already being hooked up to computers all the time to simulate (very simple) inputs and check how their brains respond. I don’t think on a “human history” time scale we’re far from creating alternate realities for our brains to experience. Perhaps not as vivid or complex as our own reality, but far we are not. Anyway, the argument here is that you do not know whether it’s happening to you this very second. That’s Kant’s view, that the reality you experience is not the actual, true reality. You see a “filtered version” of the true reality. That’s what I’m trying to illustrate.
Please don’t think I take this seriously. This is merely me using logic operating in a closed framework of our design to show that Kant’s argument is futile and pointless. Not that I can prove him wrong, I don’t think anyone can prove him wrong. But in so far as it’s utterly pointless even if he’s right.
How can you make conclusions of anything if it is not based on reality and has not purpose.
Exactly. Hey, you brought up Kant.
Ultimately the danger for me debating this in a skeptics forum is getting banned.
Oh please I haven’t had as stimulating a conversation in a long time. I’ve been over this logic many times but still, this isn’t exactly fodder for the local braai. The forum gets boring when everyone just agrees. I doubt you’d ever be banned for being questioning on a skeptic forum. It is kind of the point, I do believe no idea is beyond criticism. There is a point where people are flogging a dead horse, and one could get tired of re-stating the same argument over-and-over to idiots. But dude you are so far from that… I mean damn, arguing debating with teleo was like trying to hold water in a colander. This is debate, and is stimulating, such is welcomed (by me anyway).
ps. I type really fast sorry for the wall of text, it’s a weakness of mine.