He wrote at a time when our poetical language was yet unformed, when the meaning of our phrases was yet in fluctuation, when words were adopted at pleasure from the neighbouring languages, and while the Saxon was still visibly mingled in our diction.  The reader is, therefore, embarrassed at once with dead and with foreign languages, with obsoleteness and innovation.  In that age, as in all others, fashion produced phraseology, which succeeding fashion swept away before its meaning was generally known, or sufficiently authorised:  and in that age, above all others, experiments were made upon our language, which distorted its combinations, and disturbed its uniformity.

If Shakespeare has difficulties above other writers, it is to be imputed to the nature of his work, which required the use of the common colloquial language, and consequently admitted many phrases allusive, elliptical, and proverbial, such as we speak and hear every hour without observing them; and of which, being now familiar, we do not suspect that they can ever grow uncouth, or that, being now obvious, they can ever seem remote.

These are the principal causes of the obscurity of Shakespeare; to which might be added the fulness of idea, which might sometimes load his words with more sentiment than they could conveniently convey, and that rapidity of imagination which might hurry him to a second thought before he had fully explained the first.  But my opinion is, that very few of his lines were difficult to his audience, and that he used such expressions as were then common, though the paucity of contemporary writers makes them now seem peculiar.

Authors are often praised for improvement, or blamed for innovation, with very little justice, by those who read few other books of the same age.  Addison, himself, has been so unsuccessful in enumerating the words with which Milton has enriched our language, as, perhaps, not to have named one of which Milton was the author; and Bentley has yet more unhappily praised him as the introducer of those elisions into English poetry, which had been used from the first essays of versification among us, and which Milton was, indeed, the last that practised.

Another impediment, not the least vexatious to the commentator, is the exactness with which Shakespeare followed his authors.  Instead of dilating his thoughts into generalities, and expressing incidents with poetical latitude, he often combines circumstances unnecessary to his main design, only because he happened to find them together.  Such passages can be illustrated only by him who has read the same story, in the very book which Shakespeare consulted.

He that undertakes an edition of Shakespeare, has all these difficulties to encounter, and all these obstructions to remove.

The corruptions of the text will be corrected by a careful collation of the oldest copies, by which it is hoped that many restorations may yet be made:  at least it will be necessary to collect and note the variation as materials for future criticks; for it very often happens that a wrong reading has affinity to the right.