The problem with human communication is that it's fluid, not absolute.
What I say today may feel absolutely true at this moment, but what I say tomorrow may contradict today's statement. I don't care if this is emotional communication (like between friends or lovers) or if it's business communication.
Granted, if you keep track, try to look at some sort of drift check, then maybe you can discern from your own statements what you believe. Or rather, what you profess to believe.
But the problem rests in that very word. Belief. Beliefs, despite what we'd like to, er, believe, are transitory. Sometimes beliefs take time to morph; obviously what I believe about what the world is has changed since I was five -- new information has come along.
Aside from facts, we end up with emotional content. What I believe about the integrity of a person may morph over time simply from repetitive experience. Or it might be augmented by something baser like they smell bad. Stupid, theoretically dismissible, but that wad of dog crap wedged in their shoe may woo my opinion from Good to Bad.
Unfortunately, these influences are often subtler than that (Because, said Scrooge, a little thing affects them. A slight disorder of the stomach makes them cheats. You may be an undigested bit of beef, a blot of mustard, a crumb of cheese, a fragment of an underdone potato. There's more of gravy than of grave about you, whatever you are!) You don't always know why you form an opinion or take an action, but more often than not, it's not a logical decision.
And I don't think that's all that bad. We have to be human, after all, and part of the human condition is being wooed by our organic nature. I believe it's that randomness that adds a sense of mystery and wonder to the world, but at the same time, it can't be the only thing that runs our lives...
No answers, just a ramble...