The document summarizes Quintus Horatius Flaccus' "Ars Poetica", a letter of advice to two sons of a Roman senator on the art of poetry. It outlines Horace's views on various aspects of poetry such as plot, characterization, style, meter and the progression of drama in Greece. Some of his most famous maxims are highlighted, such as poetry both instructing and delighting, as well as the importance of consistency, decorum and avoiding extremes. The summary emphasizes the enduring influence and importance of Horace's work as one of the earliest texts on literary criticism.