Read it through once

The third duty is to the public. The critic has to educate the public taste, to raise its level of appreciation, and to prevent the tyranny of mere fashion. He must resist the casual judgments of popularity and must endeavor to present reasoned and informed judgments. The critic's task is not merely negative — to expose the faults of bad writing — but positive: to illuminate the principles by which good writing can be recognized and valued. This is an ethical duty as well as an intellectual one: the critic who fails to perform it is responsible for the deterioration of taste and for the encouragement of mediocrity.