Fielding on Criticism

Now, in reality, the world have paid too great a compliment to critics, and have imagined them men of much greater profundity than they really are. From this complacence, the critics have been emboldened to assume a dictatorial power, and have so far succeeded, that they are now become the masters, and have the assurance to give laws to those authors from whose predecessors they originally received them.
The critic, rightly considered, is no more than the clerk, whose office it is to transcribe the rules and laws laid down by those great judges whose vast strength of genius hath placed them in the light of legislators, in the several sciences over which they presided. This office was all which the critics of old aspired to; nor did they ever dare to advance a sentence, without supporting it by the authority of the judge from whence it was borrowed.
But in process of time, and in ages of ignorance, the clerk began to invade the power and assume the dignity of his master. The laws of writing were no longer founded on the practice of the author, but on the dictates of the critic. The clerk became the legislator, and those very peremptorily gave laws whose business it was, at first, only to transcribe them.

--Henry Fielding: The History of Tom Jones, a Foundling, V.1