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How Do We Know Something is True?

Sunstone

De Diablo Del Fora
Premium Member
...all inductive claims are defeasible I think..

Good insight! I would agree with you.

For your information, as you might suspect, the question of whether or not knowledge is indefeasible is currently being hotly debated in the philosophy of the sciences.
 

SalixIncendium

अहं ब्रह्मास्मि
Staff member
Premium Member
What is true cannot be untrue, yet facts have been proven untrue many times in the past, so they are not truth. Facts are evidence of truth, very creditable and reliable evidence of truth.

Were the "facts" that were proven untrue ever indeed facts to begin with? Perhaps they were relative truths that were disproven once new discoveries were made?
 

BSM1

What? Me worry?
Discussions involving personal truths devolve to mental arm wrestling. Discussions on Universal Truths not so much.

Which UT are you referring to?


So what, I need to spell it out for you?

What is true cannot be untrue, yet facts have been proven untrue many times in the past, so they are not truth. Facts are evidence of truth, very creditable and reliable evidence of truth.

You've got this absolutely backwards; and that's the truth.
 

Sunstone

De Diablo Del Fora
Premium Member
Something thinks, therefore something exists. Everything else could be systems that only exist within that somethings capacity to think. Something is known to be true in a system if it is analytically proven within the rules of that system. Something is accepted as true if it reliable within that system. Reliability is best measured through statistics.

True means that it corresponds to the reality of the system.

Objections?

No objections, but mere curiosity: Is there any room in your views for synthetic knowledge?
 

Sunstone

De Diablo Del Fora
Premium Member
I'd say the basic meaning of 'truth' is conformity with reality. So a plain accurate statement about reality, which does not mislead by omission, is true.

It seems to me you're off to an exceptionally good start. To define truth as conformity to reality seems compatible with the Correspondence Theory of Truth -- which is the oldest and most widely accepted theory, and can be paraphrased as, "Truth is a property of the relationship between a proposition about a reality and the reality itself".

Hmm. No, strike 'indefeasible' ─ that's much too rigorous.

If you are genuinely curious, the reason I've chosen to define "knowledge" as an indefeasible justified truth belief, rather than less rigorously, as merely a justified true belief, is because of Gettier Cases. Those are special cases in which you can have a justified true belief that is, nevertheless, not knowledge. Consequently, the additional rigor. If you're intrigued: Gettier Problem.

Do we know something if we genuinely believe on reasonable grounds that something is the case? I guess so, but I would have thought I know a lot more things than I know on reasonable grounds.

Could you give an example of something that you know sans reasonable grounds for claiming that you know it?
 

Curious George

Veteran Member
No objections, but mere curiosity: Is there any room in your views for synthetic knowledge?
Absolutley. Does that however mean that we can know that our synthetic knowledge is true? I know how to ride a bike. This is different than knowledge that. But me knowing how to ride a bike is contingent on other assumed truth regarding the system. That is to some degree even knowledge how is rooted in synthetic knowledge. However it is analytically true to say that if my synthetic knowledge is indeed knowledge, then I know how to ride a bike. This is truth. It cannot be false within the system.
 

blü 2

Veteran Member
Premium Member
Correspondence Theory of Truth -- [...] "Truth is a property of the relationship between a proposition about a reality and the reality itself".
And looks to me like the same thing as 'accuracy'.
I've chosen to define "knowledge" as an indefeasible justified truth belief, rather than less rigorously, as merely a justified true belief, is because of Gettier Cases.
I got as far as this:

"The person’s belief that p needs to be true. If it is incorrect instead, then — no matter what else is good or useful about it — it is not knowledge. It would only be something else, something lesser. Admittedly, even when a belief is mistaken it can feel to the believer as if it is true. But in that circumstance the feeling would be mistaken; and so the belief would not be knowledge, no matter how much it might feel to the believer like knowledge."​

And I thought, that can't be right: it's wholly possible to be mistaken in what you know, yet that doesn't stop you knowing it.

Not only that, but the statement above assumes that there is some wholly objective test of what is 'true' ─ in my terms, whether a statement about reality is exactly accurate or not. But 'truth' changes. It's simply our best opinion from time to time.

(Then I got to the Gettier cases, and thought, how on earth does the observation 'ten coins in Jones' pocket' justify the conclusion 'reason why Jones gets the job'? I see no 'justification' there. So I backed off.)
 

Sunstone

De Diablo Del Fora
Premium Member

oldbadger

Skanky Old Mongrel!
How do we know that something, such as a claim, proposition, or assertion, is true? Put differently, what constitutes evidence for a truth claim?
We don't know....... and 'evidence for truth' has failed so often, for so many differing reasons......

Is whether or not something "feels true" to us a reliable guide to whether or not it actually is true?
No..... Although experience can build upon 'intuition' and 'feeling' it is not a reliable guide on its own. Where 'feeling' helps towards truth is that wise people can 'take more interest' and 'focus more closely' upon a thing when their feelings 'ring'. Some people call these feelings 'Tells'.

Can we trust authorities, such as a person, tradition, or scripture, to tell us whether something is true?
Most sadly, No. unfortunately humans are very prone to following agendas, prone to corruptions, or just plain incompetent. We have to individually investigate to out best abilities.

Are the sciences our most reliable guides to truths?
No! I am reminded of the Grenfell Tower fire, in a building designed, tested, approved, protected...... by sciences. The people believed in the building and even obeyed the rule to 'Stay in their flats' while everything burned its way to theirs.

For those of us who enjoy saying things like, "It depends on what you mean by 'truth'.", or "It depends on what you mean by 'to know'.", here two suggested definitions:
..................OK.......

A proposition is true to the extent to which it corresponds to a state of affairs.
No. Unfortunately propositions can be untruths to the extent that they correspond to a state of affairs.

Knowledge is indefeasible justified true belief.
No....... most sadly, knowledge is a word long ago usurped by villains, deceivers, fools, as well as genuine investigators.

Feel free to use your own definitions of those words, but please make clear what your own definitions are.
That's harder! After a lifetime of smashing up people's certitudes (I regularly worked as a defence detective) all I can offer is that:-
'Knowledge is the idea that happens to be in Fashion'.

BONUS QUESTION: What, if anything, is the relationship of logic to truth?
Logic is the wise old owl building it's nest in a tree that it can not know will be cut down next week ..... truly!
 

Jumi

Well-Known Member
I think you're off to a good start, but it's unclear to me why you said "knowable", rather than something along the lines of "...then the claim is true"?
Basically I meant to say that the claim can be evaluated as being true in that case. :)
 
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