Ernest Hemingway said this:

You write until you come to a place where you still have your juice and know what will happen next and you stop and try to live through until the next day when you hit it again.

He was talking about writing books, but I find his advice perfectly apt for what I’m doing with Daring Fireball. Without having a boss or editor, I could do anything at the start of the day. Leaving off the day before with something specific in mind for what to do next is an enormous aid to getting going.

From an interview with John Gruber