@Fido,
Fido;70324 wrote:"Know" has a social significance... Again, the truth is a form, and like all forms is a form of relationship....The practical use is that it serves the relationship...
"Know" does have a social significance, since when you claim that you know, you are assuring others that you have investigated the matter as thoroughly as the claim merits, and that they can rely on you for that assurance. And, of course, what investigations you have performed will largely depend on what stakes are involved. When you say that you know that Peter has murdered someone, it is different from saying that you know that Paul likes chocolate ice-cream. You had better be surer of your investigatory efforts in the first case than in the second case. For a lot more depends on it.
And truth is a relation. It is a relation between a sentence, or a belief, and a state of affairs in the world. So that, if the sentence (or belief) that the cat is on the mat, is true, then in the world, there is a state of affairs such that there is a cat, and there is a mat, and the cat is in a certain relation to the mat which is meant by the term "on". Failing that, the sentence that the cat is on the mat is false. That relationship is often called, "correspondence". The sentence (or belief) corresponds to the state of affairs in the world.
As Aristotle put the matter, "To say what is true is to say that what is, is, and to say what is not, is not". Seems true to me.