The latter half of the eighteenth century has been styled the Age of Enlightenment, a convenient name for a period in which there was a noticeable attempt to face the obvious, external facts of life in a clear-eyed and courageous way. The centralizing of political power in the hands of Louis XIV. of France and his successors had been accompanied by a "standardizing" of human affairs which favored practical efficiency and the easier running of the social machine, but which was far from helpful to the self-expression of distinctly-marked individuals. The French became sovereign arbiters of taste and form, but their canons of art were far from nature and the free impulses of mankind. The particular development of this spirit of clarity in Berlin, the centre of German influence, lay in the tendency to challenge all historic continuity, and to seek uniformity based upon practical needs. Rousseau's revolutionary protests against inequality and artificiality--particularly his startling treatise _On the Origin and Foundations of Inequality among Men_ (1754)--and his fervent preaching of the everlasting superiority of the heart to the head, constitute the most important factor in a great revolt against regulated social institutions, which led, at length, to the "Storm and Stress" movement in Germany, that boisterous forerunner of Romanticism, yet so unlike it that even Schlegel compared its most typical representatives to the biblical herd of swine which stampeded--into oblivion. Herder, proclaiming the vital connection between the soul of a whole nation and its literature, and preaching a religion of the feelings rather than a gospel of "enlightenment;" young Goethe, by his daring and untrammeled Shakespearian play, _Goetz von Berlichingen_, and by his open defiance, announced in _Werther_, of the authority of all artistic rules and standards; and Bürger, asserting the right of the common man to be the only arbiter of literary values, were, each in his own way, upsetting the control of an artificial "classicism." Immanuel Kant, whose deep and dynamic thinking led to a revolution comparable to a cosmic upheaval in the geological world, compelled his generation to discover a vast new moral system utterly disconcerting to the shallow complacency of those who had no sense of higher values than "practical efficiency."