Those are two different propositions. The first one is a claim about me , about what I know . So what we're concerned with now is truth , not knowledge . Truth is different from knowledge, just as it is different from belief. Before we get into some positive theories of truth, I want to quickly introduce one bit of terminology.
Propositions are what sentences are supposed to express.
Anyway, I'm going to put theories of truth in terms of propositions, as you'll see.