In the poem "Much Madness is divinest Sense," what is the meaning of the two paradoxes in the first few lines?What is really the poem's message?

Emily Dickinson's poem expresses the paradox that what is
sometimes regarded as madness or craziness is actually perfectly sensible, and what
sometimes seems to make perfect sense is actually madness.  The paradoxes are reversals
of each other.  These paradoxes are the statement of the theme of the poem.  The poem
goes on to explain her a point a bit further.  She explains that it is the majority (of
people) who decide what is "sane" and if one goes along with the majority, then that
he/she is considered sane, but that if one demurs (objects) then he/she is considered
crazy and will be treated that way.

While we have no
expressed idea about what inspired this poem for Dickinson, we can certainly see its
relevance in all kinds of big and small examples in our everyday lives.  If the majority
of people decide that a certain fashion trend is great, then anyone wearing that trend
is considered fashionable; anyone who doesn't, isn't. This could apply to anything that
is "popular."  Dickinson's reclusive behavior might have been considered mad, but it
made perfect sense to her and how she wanted to live her life.  Dickinson's first and
only submission to have her poetry considered for publication ended in a rejection
letter, but she knew she wrote great poetry and we certainly know that today!  Who is to
say what is mad and what is sane?