Most people seem to think that getting an idea is both mysterious and simple.
Mysterious, because inspiration must come from a particular state of grace with which only the most gifted souls are blessed. Simple, because ideas are expected to drop into one's mind in words and pictures, ready to be transcribed and copied in the form of a book, complete with endpapers and cover. The word get expresses these expectations well. Yet nothing could be further from the truth. It is true that, from time to time, from the endless flow of our mental imagery, there emerges unexpectedly something that, vague though it may be, seems to carry the promise of a form, a meaning, and, more important, an irresistible poetic charge.