"After those who write letters in performance of a disagreeable duty, and almost side by side with them in point of insignificance, I should put those who write in a manner wholly external, wholly superficial, devoted only to flattery, lavishing praise like gold, without counting it; and those also who weigh every word, who reply formally and pompously, with a view to fine phrases and effects. They exchange words only, and choose them solely for their brilliancy and show. You think it is you, individually, to whom they speak; but they are addressing themselves in your person to the four corners of Europe. Such letters are empty, and teach as nothing but theatrical execution and the favorite pose of their writers. "I will not class among the latter the more prudent and sagacious authors who, when writing to individuals, keep one eye on posterity. We know that many who pursue this method have written long, finished, charming, flattering, and tolerably natural letters. Beranger furnishes us with the best example of this class. "Proudhon, however, is a man of entirely different nature and habits. In writing, he thinks of nothing but his idea and the person whom he addresses: ad rem et ad hominem. A man of conviction and doctrine, to write does not weary him; to be questioned does not annoy him. When approached, he cares only to know that your motive is not one of futile curiosity, but the love of truth; he assumes you to be serious, he replies, he examines your objections, sometimes verbally, sometimes in writing; for, as he remarks, 'if there be some points which correspondence can never settle, but which can be made clear by conversation in two minutes, at other times just the opposite is the case: an objection clearly stated in writing, a doubt well expressed, which elicits a direct and positive reply, helps things along more than ten hours of oral intercourse!' In writing to you he does not hesitate to treat the subject anew; he unfolds to you the foundation and superstructure of his thought: rarely does he confess himself defeated--it is not his way; he holds to his position, but admits the breaks, the variations, in short, the EVOLUTION of his mind. The history of his mind is in his letters; there it must be sought.