When I make an assertion there must first be a world disclosed to us that makes the act of asserting possible. I can't make an assertion about the computer before me without there first being a whole slew of understandings about what a computer is, the room in which I find myself, and so forth. It is the whole set of understandings that make assertion possible. To consider truth a mere property of propositions or sentences is to fundamentally mistake what truth is and where the question of truth is located.And that's the case, much like it is wrong to consider being a mere property--a boolean, either something is or isn't--of things. An existential property and propositions aren't necessarily incorrect, but it is a mistake to consider them to be all there is. Read the whole thing.