Louis Zukofsky said this quote

This time it was the sentence opening the last part of a story I had worked on for months: a sentence as is often worked off paper first. The pace of narrative and interest in character do not readily help the writer's hand to set down a sentence of that order. For though characters must take things in their own stride – somewhere in his story the writer cannot hold back this sentence that judges them. He wants it unobtrusive to his pace and the characters that caused him to write. The difficulty is to judge without seeming to be there, with a finality in the words that will make them casual and part of the story itself, except perhaps to another age.