The poets aim is either to profit or to please, or to blend in one the delightful and the useful. Whatever the lesson you would convey, be brief, that your hearers may catch quickly what is said and faithfully retain it. Every superfluous word is spilled from the too-full memory.
Horace (1928). “Horace on the Art of Poetry: Latin Text, English Prose Translation, Introduction and Notes, Together with Ben Jonson's English Verse Rendering”