I argued earlier that truth is a convention.
And that the Truth exists but will never be known. Not in its entirety, anyway.

Then what are we left with?
How can any of us decide what is true and what is not?

First of all, any convention needs three things. The two convening parts and the object of their convention.

‘So, you want us to believe that truth is a make-believe?!?’

That it can be, yes!

And the further from the real truth – from reality itself, that convened about truth is, the worse the fate the believers will eventually have to face.

The first example which jumps to my mind is the fate of Bernie Madoff and ‘his’ investors.
Bernie and each of the investors had convened a truth. That his investment fund was sound.
Consider what happened to each of them. To each of the investors and to Bernie Madoff himself.

I’ll come back.