Remember you must die whether you sit about moping all day long or whether on feast days you stretch out in a green field, happy with a bottle of Falernian from your innermost cellar.
It is no great art to say something briefly when, like Tacitus, one has something to say; when one has nothing to say, however, and none the less writes a whole book and makes truth into a liar - that I call an achievement.
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.