Those Who Know a Thing or Three

There's those who know a thing or three
And those a thing or two
Then there's some who don't know one
Or have the slightest clue

So in the shell that holds the nut
There's little more to say
Except the first finds excellence
Uncommon to the day

While then again the second holds
an eye we can't distain
to recognize when best unmasks
and makes its presence plain

Which brings us to the latter case
that most of us subscribe
Who neither conjure wonder up
nor in its web abide.