Grammar is the Art of rightly expressing our thoughts by Words.
Grammar in general, or Universal Grammar, explains the Principles which
are common to all languages.
The Grammar of any particular Language, as the English Grammar, applies
those common principles to that particular language, according to the
established usage and custom of it.
Grammar treats of Sentences, and the several parts of which they are
compounded.
Sentences consist of Words; Words, of one or more Syllables; Syllables,
of one or more Letters.
So that Letters, Syllables, Words, and Sentences, make up the whole
subject of Grammar.