Bonnie Friedman said this quote

We should be told: Write fast, write close to the bone, write for ten hours straight until you’re not thinking in words anymore, but in colors, in smells, in waves of memory. Right what you care about. Don’t write one more word you don’t care about. Don’t waste any more of your life on what does not matter to you. Write only what matters to you—those scenes, those dialogues. Get messy. Before you get neat, get very, very messy. Write until you are more alive than you have ever been before.