Here’s a great quote on writing (by Ernest Hemingway) that I ran across the other day:
“There is no rule on how to write. Sometimes it comes easily and perfectly; sometimes it’s like drilling rock and then blasting it out with charges.”
Most writers I know would agree, although we’d all say that “easily and perfectly” is pretty darn infrequent. In fact, it’s more likely to be “rarely.” And if the words come easily, they usually aren’t perfect, although in the editing process you might go back and feel they come out pretty well. But “drilling rock”: yeah, that’s it for sure.