michel said:
...could
you prove that man walked on the moon ? ( without accepting certain some data on trust?)
Michel, michel, michel...you seem like a sensible guy but you have to stop using that argument. It's appeared on this thread twice from your keys and you've posted it on other threads as well.
I don't want to suggest it's unworthy...it's always heartning to see reasonable doubt (seriously). But if you insist on frequenting this tidy bit, you have to take it to it's own conclusion.
Can anyone prove that man walked on the moon. No. Can those astronauts prove they were on the moon? No. Does my cat fly when i chuck her out the window? No, but it was fun trying to prove it.
Essentially, all data can be subject to doubt, obviously. All data is subjective. Not just it's accuracy or relevence, but it's very existence, and that means ALL data. If i feel unsure that i have oh, let's say pubic hair, i can reference the last time i looked at my crotch and remember "oh yeah, it was there last time i checked." That's generally how we use empirical data. I trust my recollection, so i'm naturally satisfied. But if I have doubts, i can gather evidence by dropping my pants and checking again, no? (yep, still there). Now equiped with a priori (sense) datum, i can again feel confident that everything is as i left it. But what happens when i pull my pants back up? Has it changed in the 2 seconds since i last refered to my nethers? What's more, how objective can i be about the sense datum i initially collected? Because of limitations of perception, there is no logical reason to believe anything you see, hear, smell, etc.
I might not have sufficient faculties to judge by absolute measures the conditions withing my shorts. If i subject the question to peer review (expose myself to anyone walking by) how do i judge and evaluate the empirical data they give me (confirming or denying my hypothesis of bushness) but by means of 'trusting' that their eyes see my short hairs much the way mine do.
I have no means of ever really knowing anything at any given time because ultimately, no datum of any sort can be absolutely trusted. I can always get a gist of what might be, or the insinuation of beingness, or maybe go as far as to believe in matter. But it is utterly impossible to prove beyond all doubt that anything is, or was or will be (or not). That's were logic's something of a *****-if you remove all systems of verification or posibility of acknowledgement you can prove nothing but the absurdity of logic.