Is There a Consciousness Principle?

In the human case, if I'm thinking, oh, John might have a cup of coffee after lunch. I might even then believe that you will, but I'll believe it in a way that's uncertain. And the thought is that I have this uncertain belief which matches an uncertain event. Now, so long as we're not deterministes, we might say, well, in the second, second belief, you've got things wrong. But what we think is wants to do is to say that actually that principle is wrong. This is sometimes said to be Iamlicus's principle, because you find something a bit similar in I amlicus and certainly Boethius was