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, that we are struck with a _Surprize_; from whence the high _Brilliancy_ and _Sparkling_ of WIT, result. Whereas _Auxiliary_ Subjects, introduced upon such Occasions, as they have been frequently exhibited before, are apt to fall dull, and heavy upon the Fancy; and unless they possess great natural Spirit, will excite no sprightly Sensation. It is also necessary to observe, that, in WIT, the Subjects concern'd must be _ordinary_ and _level_; By which are intended, not such as are _common_, but such as have no _extraordinarily exalted_, or _enlarged_, Qualities; and are not _unsizeable_ in the particular Circumstances in which they are compared to each other;--otherwise it is easy to perceive, that the Result of their _Arrangement_ will not be so properly WIT, as either the SUBLIME, or BURLESQUE. To all this is to be added, that either _Gallantry, Raillery_, _Humour_, _Satire_, _Ridicule_, _Sarcasms_, or other Subjects, are generally blended with WIT; It has been for want of this Discovery, and of a proper Separation of these Subjects, that the Attempts which have hitherto been made to _define_ WIT, have been all involv'd and overwhelm'd in Perplexity; For the different Mixtures of these foreign Ingredients with WIT, have discover'd such various and opposite _Colours_ and _Substances_, as were impossible to be comprehended in one certain steady _Definition_;--Whereas _pure_ WIT alone, constantly appears in _one uniform_ Manner; which is, _In the _quick Elucidation_ of one Subject, by _unexpectedly_ exhibiting its _Agreement_ or _Contrast_ with another Subject_. It is proper in this Place, to distinguish between WIT, SIMILES, and METAPHORS. SIMILES, though they _illustrate_ one Subject, by _arranging_ it with another Subject, are yet different from WIT, as they want its _sudden_ and _quick Elucidation_. Again; In WIT, the _Elucidation_ is thrown only upon _one_ Point of a Subject; or if more Points be _elucidated_, they are so many different Strokes of WIT;--Whereas every SIMILE touches the Subject it _illustrates_ in _several Points_. It is from hence, that the _Elucidation_, as before mention'd, arising from a SIMILE, is _slower_ than from WIT; But then is is generally more _accurate_ and _compleat_;--In short, WIT, from its _Quickness_, exhibits more _Brilliancy_, But SIMILES possess greater _Perfection_. A METAPHOR, is the _Arrayment_ of one Subject, with the _Dress_, or _Colour_, or any _Attributes_, of another Subject.