Men like him cannot be happy as we understand happiness, for to be happy one must delight like nature in mere profusion, in mere abundance, in making and doing things, and if one sets an image of the perfect before one it must be the image that draws her perpetually, the image of a perfect fulness of natural life, of an Earthly Paradise.

William Butler Yeats, “The Happiest of the Poets” in Ideas of Good and Evil