l'esprit de l'escalier

Most people… only see the surface reality of writing and think of writers as involved in quiet, intellectual work done in their study. If you have the strength to lift a coffee cup, they figure, you can write a novel. But once you try your hand at it, you soon find that it isn’t as peaceful a job as it seems. The whole process—sitting at your desk, focusing your mind like a laser beam, imagining something out of a blank horizon, creating a story, selecting the right words, one by one, keeping the whole flow of the story on track—requires far more energy, over a long period, than most people ever imagine.

Haruki Murakami, What I Talk About When I Talk About Running