Ali Shaw said this quote

After a long while he sat upright with great effort, exhaled a sigh and reached for a clean sheet of lined paper, smoothing it out on the desk. He unscrewed the lid of his fountain pen, laid it perpendicular to his paper, and began to write. Often he compared his writing to white water. He had only to leap in to be dragged away on its rapids, thrown this way and that with his own will rendered impotent. While writing he found the words came from the muscles in his hands, the feel of the shaft of his pen, the locked joint of his elbow. the scratching noise of the nib marking paper and, underneath all that, some coordinating impulse in his guts. Certainly not from his mind.