The many conditions of intellectual productiveness are still hidden in such profound obscurity that we are unable to explain why a period of stormy moral agitation seems to be in certain natures the indispensable antecedent of their highest creative effort. Byron is one instance, and Rousseau is another, in which the current of stimulating force made this rapid way from the lower to the higher parts of character, and only expended itself after having traversed the whole range of emotion and faculty, from their meanest, most realistic, most personal forms of exercise, up to the summit of what is lofty and ideal. No man was ever involved in such an odious complication of moral maladies as beset Rousseau in the winter of 1758. Yet within three years of this miserable epoch he had completed not only the New Heloïsa, which is the monument of his fall, but the Social Contract, which was the most influential, and Emilius, which was perhaps the most elevated and spiritual, of all the productions of the prolific genius of France in the eighteenth century. A poor light-hearted Marmontel thought that the secret of Rousseau's success lay in the circumstance that he began to write late, and it is true that no other author, so considerable as Rousseau, waited until the age of fifty for the full vigour of his inspiration. No tale of years, however, could have ripened such fruit without native strength and incommunicable savour. Nor can the mechanical movement of those better ordered characters which keep the balance of the world even, impart to literature that peculiar quality, peculiar but not the finest, that comes from experience of the black unlighted abysses of the soul. The period of actual production was externally calm. The New Heloïsa was completed in 1759, and published in 1761. The Social Contract was published in the spring of 1762, and Emilius a few weeks later. Throughout this period Rousseau was, for the last time in his life, at peace with most of his fellows. Though he never relented from his antipathy to the Holbachians, for the time it slumbered, until a more real and serious persecution than any which he imputed to them, transformed his antipathy into a gloomy frenzy.