" his eyes narrowed in what seemed to be intense pain or grief, and others when he’d shudder violently. Whichever way it happened, he was left helplessly weak as the words formed inside him, waiting to be recited into the world. The pain was an essential part of it, part of the birthing process, for this is what he was doing: verse by verse, he was giving birth to the Quran. "

― Lesley Hazleton , The First Muslim: The Story of Muhammad