“Progress comes by experiment, and this from ennui that leads to voyages, wars, revolutions, and plainly to change in the arts of expression; that cries out to the imagination, and is the nurse of the invention whereof we term necessity the mother.” ArtWarMotherTermImaginationProgressCryExpressionRevolutionExperimentsInventionNurseVoyagesEnnui Book:Poets of America Source: Poets of America