of complying with the wishes of his father. A line of Homer, an idea from the Principia, an interesting problem in algebra or geometry, was enough to restore the eternally invincible spell of knowledge. And no sooner was this commanding interest touched, than the cloud of uncomfortable circumstance vanished from before the sun, and calm and serenity filled his spirit.

Montesquieu used to declare that he had never known a chagrin which half an hour of a book was not able to dispel. Diderot had the same fortunate temper.

Yet Diderot was not essentially a man of books. He never fell into the characteristic weakness of the follower of letters, by treating books as ends in themselves, or placing literature before life. Character, passion, circumstance, the real tragi-comedy, not its printed shadow and image, engrossed him. He was in this respect more of the temper of Rousseau, than he was like Voltaire or Fontenelle. "Abstraction made," he used to say, "of my existence and of the happiness of my fellows, what does the rest of nature matter to me?" Yet, as we see, nobody that ever lived was more interested in knowledge. His biographer and disciple remarked the contrast in him between his ardent impetuous disposition and enthusiasm, and his spirit of close unwearied observation. Faire le bien, connaître le vrai, was his formula for the perfect life, and defined the only distinction that he cared to recognise between one man and another. And the only motive he ever admitted as reasonable for seeking truth, was as a means of doing good. So strong was his sense of practical life, in the midst of incessant theorising.

At the moment when he had most difficulty in procuring a little bread each day for himself, Diderot conceived a violent passion for a seamstress, Antoinnette Champion by name, who happened to live in his neighbourhood. He instantly became importunate for marriage. The mother long protested with prudent vigour against a young man of such headstrong impetuosity, who did nothing and who had nothing, save the art of making speeches that turned her daughter's head. At length the young man's golden tongue won the mother as it had won the daughter. It was agreed that his wishes should be crowned, if he could procure the consent of his family. Diderot fared eagerly and with a sanguine heart to Langres. His father supposed that he had seen the evil of his ways, and was come at last to continue the honest tradition of their name. When the son disclosed the object of his visit, he was treated as a madman and threatened with malediction. Without a word of remonstrance he started back one day for Paris. Madame Champion warned him that his project must now be for ever at an end. Such unflinching resoluteness is often the last preliminary before surrender. Diderot fell ill. The two women could not bear to think of him lying sick in a room no better than a dog-kennel, without broths and tisanes, lonely and sorrowful. They hastened to nurse him, and when he got well, what he thought the great object of his life was reached. He and his adored were married (1743).[16] As has been said, "Choice in marriage is a great match of cajolery between purpose and invisible hazard: deep criticism of a game of pure chance is time wasted." In Diderot's case destiny was hostile.

His wife was over thirty. She was dutiful, sage, and pious. She had plenty of that devotion which in small things women so seldom lack. While her husband went to dine out, she remained at home to dine and sup on dry bread, and was pleased to think that the next day she would double the little ordinary for him. Coffee was too dear to be a household luxury, so every day she handed him a few halfpence to have his cup, and to watch the chess-players at the Café de la Régence. When after a year or two she went to make her peace with her father-in-law at Langres, she wound her way round the old man's heart by her affectionate caresses, her respect, her ready industry in the household, her piety, her simplicity. It is, however, unfortunately possible for even the best women to manifest their goodness, their prudence, their devotion, in forms that exasperate. Perhaps it was so here. Diderot at fifty was an orderly and steadfast person, but at thirty the blood of vagabondage was still hot within him. He needed in his companion a robust patience, to match his own too robust activity. One may suppose that if Mirabeau had married Hannah More, the union would have turned out ill, and Diderot's marriage was unluckily of such a type. His wife's narrow pieties and homely solicitudes fretted him. He had not learned to count the cost of deranging the fragile sympathy of the hearth. While his wife was away on her visit to his family, he formed a connection with a woman (Madame Puisieux) who seems to have been as bad and selfish as his wife was the opposite. She was the authoress of some literary pieces, which the world willingly and speedily let die; but even very moderate pretensions to bel-esprit may have seemed wonderfully refreshing to a man wearied to death by the illiterate stupidity of his daily companion.[17] This lasted some three or four years down to 1749. As we shall see, he discovered the infidelity of his mistress and broke with her. But by this time his wife's virtues seem to have gone a little sour, as disregarded prudence and thwarted piety are so apt to do. It was too late now to knit up again the ravelled threads of domestic concord. During a second absence of his wife in Champagne (1754), he formed a new attachment to the daughter of a financier's widow (Mdlle. Voland). This lasted to the end of the lady's days (1783 or 1784).

There is probably nothing very profitable to be said about all this domestic disorder. We do not know enough of the circumstances to be sure of allotting censure in exact and rightful measure. We have to remember that such irregularities were in the manners of the time. To connect them by way of effect with the new opinions in religion, would be as impertinent as to trace the immoralities of Dubois or Lewis the Fifteenth or the Cardinal de Rohan to the old opinions.

CHAPTER III.
EARLY WRITINGS.

La Rochefoucauld, expressing a commonplace with the penetrative terseness that made him a master of the apophthegm, pronounced it "not to be enough to have great qualities: a man must have the economy of them." Or, as another writer says: "Empire in this world belongs not so much to wits, to talents, and to industry, as to a certain skilful economy and to the continual management that a man has the art of applying to all his other gifts."[18] Notwithstanding the peril that haunts superlative propositions, we are inclined to say that Diderot is the most striking illustration of this that the history of letters or speculation has to furnish. If there are many who have missed the mark which they or kindly intimates thought them certain of attaining, this is mostly not for want of economy, but for want of the great qualities which were imputed to them by mistake. To be mediocre, to be sterile, to be futile, are the three fatal endings of many superbly announced potentialities. Such an end nearly always comes of exaggerated faculty, rather than of bad administration of natural gifts. In Diderot were splendid talents. It was the art of prudent stewardship that lay beyond his reach. Hence this singular fact, that he perhaps alone in