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Is all truth subjective?

Is all truth subjective? A subjective truth is a truth based off of a person's perspective, feelings, or opinions. Everything we know is based off of our input - our senses, our perception. Thus, everything we know is subjective. All truths are subjective. Do you think all truths are subjective? If not, what is wrong with the above argument?

Your argument is:

(1) Our senses and perception are subjective.

(2) Everything we know is based on on our senses and perceptions.

Therefore

(3) Everything we know is subjective.

There is a well-known difficulty with this argument. It equivocates on "subjective". In the first premise "subjective" means something like the innocuous "possessed by a subject", but in the conclusion it is presumably taken to mean the toxic "not having any objective truth". There is also a doubt about the second premise. Many philosophers accept the idea of "a priori" truths, that is, truths that hold independently of experience, including mathematical truth and perhaps ethical truths, if there are any.

Your argument is: (1) Our senses and perception are subjective. (2) Everything we know is based on on our senses and perceptions. Therefore (3) Everything we know is subjective. There is a well-known difficulty with this argument. It equivocates on "subjective". In the first premise "subjective" means something like the innocuous "possessed by a subject", but in the conclusion it is presumably taken to mean the toxic "not having any objective truth". There is also a doubt about the second premise. Many philosophers accept the idea of "a priori" truths, that is, truths that hold independently of experience, including mathematical truth and perhaps ethical truths, if there are any.

Does certainty suggest or indicate truth?

Does certainty suggest or indicate truth?

Descartes sought certainty because he thought that if we know something with certainty, then it must be true. And he was right, if only because 'S knows that p' implies p, so that in 'We know with certainty that . . .' the phrase "with certainty" is redundant; there is no such thing as uncertain knowledge. I suspect that the sense of your question may be Cartesian: is it the case that certainty implies truth? There are several concepts to sort out here: 'We know for sure, or for certain, or with certainty that . . .', 'I am certain (sure) that . . .', 'I feel certain, sure, that . . .', 'It is certain that . . .' (but not 'It is sure that . . .') There is a very useful paper by G.E. Moore called "Certainty" that might be helpful here, which is sensitive to distinctions of this kind. Sean is right in his response above that psychological certainty or "feeling certain" may not be a mark of truth, though I wonder whether anyone has troubled to test the correlation empirically in humans, and whether it makes sense to think about testing it in animals. On the other hand it also seems correct that if something is indeed certain, e.g. that 7×9 = 63, then '7×9 = 63' is true.

Descartes sought certainty because he thought that if we know something with certainty, then it must be true. And he was right, if only because 'S knows that p ' implies p , so that in 'We know with certainty that . . .' the phrase "with certainty" is redundant; there is no such thing as uncertain knowledge. I suspect that the sense of your question may be Cartesian: is it the case that certainty implies truth? There are several concepts to sort out here: 'We know for sure, or for certain, or with certainty that . . .', 'I am certain (sure) that . . .', 'I feel certain, sure, that . . .', 'It is certain that . . .' (but not 'It is sure that . . .') There is a very useful paper by G.E. Moore called "Certainty" that might be helpful here, which is sensitive to distinctions of this kind. Sean is right in his response above that psychological certainty or "feeling certain" may not be a mark of truth, though I wonder whether anyone has troubled to test the correlation empirically in...

Most people believe that a belief is true if it corresponds to a fact. But facts

Most people believe that a belief is true if it corresponds to a fact. But facts and ideas are very different things. They exist in completely separate realms. How can they "correspond" to each other?

You write that facts and ideas are very different things. (You also contrast beliefs and facts to make the same point, so perhaps you believe that beliefs are ideas.) From this you infer a difficulty about the possibility of ideas and facts corresponding to one another. 'Facts and ideas are very different things', you write, so 'how can they "correspond" to each other?' Consider, though. Written notes on a stave are very different from the sounds that we hear, but why should that stop them "corresponding" to sounds? Aunts and nephews are very different kinds of beings, but that need not stop them corresponding. You put "correspond" in scare quotes, and here you seem to me to be on the right track. We need to know what correspondence is. What is say a 1:1 correspondence?

You write that facts and ideas are very different things. (You also contrast beliefs and facts to make the same point, so perhaps you believe that beliefs are ideas.) From this you infer a difficulty about the possibility of ideas and facts corresponding to one another. 'Facts and ideas are very different things', you write, so 'how can they "correspond" to each other?' Consider, though. Written notes on a stave are very different from the sounds that we hear, but why should that stop them "corresponding" to sounds? Aunts and nephews are very different kinds of beings, but that need not stop them corresponding. You put "correspond" in scare quotes, and here you seem to me to be on the right track. We need to know what correspondence is. What is say a 1:1 correspondence?