Wandering, then, on the banks of the Elbe, massing his thoughts and arranging their progression, his system slowly yet gradually expanded before him. He wrote only in moments of inspiration, yet his hours were full of such moments; little by little he drifted away from the opera and his friends into a solitude which he made populous with thought, and in this manner gave himself up so entirely to his philosophy that one day, it is reported, he astonished an innocent-minded gate-keeper, who asked him who he was, with the weird and pensive answer, "Ah! if I but knew, myself!" Meanwhile his work grew rapidly beneath his hands, and when after four years of labor and research "Die Welt als Wille und Vorstellung" was so far completed as to permit its publication, he read it over with something of the same unfamiliarity which he would have experienced in reading the work of another author, though, doubtless, with greater satisfaction. Fascinated with its merits, he offered the manuscript to Brockhaus, the Leipsic publisher. "My book," he wrote, "is a new system of philosophy, but when I say new I mean new in every sense of the word; it is not a restatement of what has been already expressed, but it is in the highest degree a continuous flow of thought such as has never before entered the mind of mortal man. It is a book which, in my opinion, is destined to rank with those which form the source and incentive to hundreds of others." Brockhaus, familiar with the proverbial modesty of young authors, lent but an inattentive ear to these alluring statements, and accepted the book solely on account of the reputation which Schopenhauer's mother then enjoyed; a mark of confidence, by the way, which he soon deeply regretted. "It is so much waste paper," he said, dismally, in after years; "I wish I had never heard of it." He lived long enough, however, to change his mind, and in 1880 his successors published a stout little pamphlet containing the titles of over five hundred books and articles, of which the "World as Will and Idea" formed the source and incentive. "Le monde," Montaigne has quaintly noted, "regorge de commentaires, mais d'auteurs il en est grand chierté."