Michael Agger on the challenges of writing:

“Serious writing is at once a thinking task, a language task, and a memory task,” [Ronald Kellogg] declares. It requires the same kind of mental effort as a high-level chess match or an expert musical performance. We are all aspiring Mozarts indeed. So what’s holding us back? How does one write faster? Kellogg terms the highest level of writing as “knowledge-crafting.” In that state, the writer’s brain is juggling three things: the actual text, what you plan to say next, and—most crucially—theories of how your imagined readership will interpret what’s being written. A highly skilled writer can simultaneously be a writer, editor, and audience.

How to Be a Faster Writer