Objectivity and again objectivity, and expression: no hindside-before-ness, no straddled adjectives (as "addled mosses dank"), no Tennysonianness of speech; nothing-nothing that you couldn't, in some circumstance, in the stress of some emotion, actually say.
Ezra PoundAnd the days are not full enough And the nights are not full enough And life slips by like a field mouse Not shaking the grass
Ezra Pound