It is the Province of WIT to _elucidate_, or _enlighten_ a Subject,
not by reasoning upon that Subject, but by a just and unexpected
Introduction of another _similar_, or _opposite_ Subject; whereby,
upon their _Arrangement_ together, the _original_ Subject may be _set
off_, and more clearly _enlighten'd_, by their obvious Comparison.

It may be proper, for the sake of Distinction, to call the Subject,
which is the Basis and Ground-work, the _original_ Subject; and that
which is introduced, in order to _elucidate_ it, the _auxiliary_
Subject.

That there be always an apparent Chain or Connexion, or else an
obvious Agreement or Contrast, between the two Subjects, is absolutely
requir'd, in order that the _Auxiliary_ one may be _justly_
introduced; otherwise, instead of WIT, there will only appear
a rambling _Vivacity_, in wild, unprovoked Sallies.

And yet _every just_ or _natural_ Introduction of an _auxiliary_
Subject will not produce WIT, unless a new _Lustre_ is reflected
from thence upon the _original_ Subject.

It is further to be observed, that the Introduction of the _auxiliary_
Subject ought not only to be _just_, but also _unexpected_, which are
entirely consistent together; For as every Subject bears various
Relations and Oppositions to other Subjects, it is evident that each
of these Relations and Oppositions upon being exhibited, will be
_unexpected_ to the Persons, who did not perceive them before; and
yet they are _just_ by Supposition.

It is upon such _unexpected_ Introductions of _auxiliary_ Subjects,