If I put 8 blocks next to 3 blocks I will have 11 blocks. This is logical inference. Can you expand upon point (2)? Do you think that 1=2 is a tautology and thus true by definition? I do, but I'm not right. When someone asserts 1=1 as a tautologically true proposition, why should I believe them? Or when they say a definition renders something true why should I believe them? I may be delirious, or dreaming the whole thing, and when I wake up I'll be in a world where tautological propositions are by definition false; the crux the problem is that our intuition has been wrong in the past, ergo to assert we can know something absolutely is just simply incorrect. Moore seems to be attacking skepticism as an alternative metaphysical thesis; he says common sense propositions ought to be trusted over skepticial propositions such as I am dreaming. He asserts his intuition to be a higher force than the skeptics: I haven't actually seen why we should trust him, so maybe you can make some remarks on that.