Much Madness is divinest Sense

"Much Madness is divinest Sense...Much Sense-the starkest Madness..."

I noticed the paradox in "Much Madness is divinest Sense," meaning insanity is good, and "Much Sense-the starkest Madness-," meaning sanity is bad.  It took me a minute to figure out what this meant.  In the poem, the majority is referred to, and the speaker says "Assent-and you are sane-Demur,you're straightway dangerous."  The author is referring to the fallacy that the majority is correct simply because they represent what most people believe.  The paradox is primarily used characterize the speaker's criticizing attitude towards the majority and their concept of sanity.  The speaker reverses the norm by telling us not to trust in the majority, for they do not know what is always sane.  Sometimes, they could have it completely wrong, and what they perceive as sane may be terribly insane.  There for it is sometimes necessary to "Demur," although the majority will probably brand you a lunatic.