Much Madness is divinest Sense—" packs in a whole lot of crazy. The cool thing about it, though, is that it flips the whole idea of crazy on its head. Not only does it suggest that so-called crazy people are the only ones who know what's going on, it also tells us that so-called normal people are actually the crazy ones. Ultimately, the thing this poem is really getting at is that what's sane and insane is far from objective—really, it's all in our heads.