The business of poets ...

... as recounted in Dr. Johnson's Rasselas (and sent along by Dave Lull):


"The business of a poet, said Imlac, is to examine, not the individual, but the species; to remark general properties and large appearances: he does not number the streaks of the tulip, or describe the different shades in the verdure of the forest. He is to exhibit in his portraits of nature such prominent and striking features, as recal the original to every mind; and must neglect the minuter discriminations, which one may have remarked, and another have neglected, for those characteristicks which are alike obvious to vigilance and carelessness.
"But the knowledge of nature is only half the task of a poet; he must be acquainted likewise with all the modes of life. His character requires that he estimate the happiness and misery of every condition; observe the power of all the passions in all their combinations, and trace the changes of the human mind as they are modified by various institutions and accidental influences of climate or custom, from the spriteliness of infancy to the despondence of decrepitude. He must divest himself of the prejudices of his age or country; he must consider right and wrong in their abstracted and invariable state; he must disregard present laws and opinions, and rise to general and transcendental truths, which will always be the same: he must therefore content himself with the slow progress of his name; contemn the applause of his own time, and commit his claims to the justice of posterity. He must write as the interpreter of nature, and the legislator of mankind, and consider himself as presiding over the thoughts and manners of future generations; as a being superiour to time and place.
"His labour is not yet at an end: he must know many languages and many sciences; and, that his stile may be worthy of his thoughts, must, by incessant practice, familiarize to himself every delicacy of speech and grace of harmony."

I think I only seriously disagree with the preference of species over individual.