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This, therefore, is our first requirement about the ideal towards which progress is directed; it must be fixed. Whistler used to make many rapid studies of a sitter; it did not matter if he tore up twenty portraits. But it would matter if he looked up twenty times, and each time saw a new person sitting placidly for his portrait. So it does not matter (comparatively speaking) how often humanity fails to imitate its ideal; for then all its old failures are fruitful. But it does frightfully matter how often humanity changes its ideal; for then all its old failures are fruitless. The question therefore becomes this: How can we keep the artist discontented with his pictures while preventing him from being vitally discontented with his art? How can we make a man always dissatisfied with his work, yet always satisfied with working? How can we make sure that the portrait painter will throw the portrait out of window instead of taking the natural and more human course of throwing the sitter out of window?