The Art of Poetry: To the Pisos (391)

Orpheus, the priest and interpreter of the gods, deterred the savage race of men from slaughters and inhuman diet; hence said to tame tigers and furious lions: Amphion too, the builder of the Theban wall, was said to give the stones motion with the sound of his lyre, and to lead them whithersoever he would, by engaging persuasion. This was deemed wisdom of yore, to distinguish the public from private weal; things sacred from things profane; to prohibit a promiscuous commerce between the sexes; to give laws to married people; to plan out cities; to engrave laws on [tables of] wood. Thus honor accrued to divine poets, and their songs. After these, excellent Homer and Tyrtaeus animated the manly mind to martial achievements with their verses. Oracles were delivered in poetry, and the economy of life pointed out, and the favor of sovereign princes was solicited by Pierian[*] strains, games were instituted, and a [cheerful] period put to the tedious labors of the day; [this I remind you of,] lest haply you should be ashamed of the lyric muse, and Apollo the god of song.

It has been made a question, whether good poetry be derived from nature or from art. For my part, I can neither conceive what study can do without a rich [natural] vein, nor what rude genius can avail of itself: so much does the one require the assistance of the other, and so amicably do they conspire [to produce the same effect]. He who is industrious to reach the wished-for goal, has done and suffered much when a boy; he has sweated and shivered with cold; he has abstained from love and wine; he who sings the Pythian strains,[*] was first a learner, and in awe of a master. But [in poetry] it is now enough for a man to say of himself:— "I make admirable verses: a murrain seize the hindmost: it is scandalous for me to be outstripped, and fairly to acknowledge that I am ignorant of that which I never learned."