There are, it seems, two Muses: the Muse of Inspiration, who gives us inarticulate visions and desires, and the Muse of Realization, who returns again and again to say, "It is yet more difficult than you thought.” This is the muse of form. The first muse is the one mainly listened to in a cheap-energy civilization, in which "economic health” depends on the assumption that everything desirable lies within easy reach of anyone. To hear the second muse one must move outside the cheap-energy enclosure. It is the willingness to hear the second muse that keeps us cheerful in our work. To hear only the first is to live in the bitterness of disappointment.