Utility is the touchstone of systems, opinions, and actions; it is the measure of our very love of truth. The most useful truths are the most admired; we call those truths great which most concern the human race; those futile which concern only a few men whose ideas we do not share.

The doctrine of utility is combined with that of necessity. Most of the French Philosophers were necessarians, but Holbach expressed the doctrine in a more extreme form than the others. Will, according to him, is a modification of the brain by which it is disposed, or prepared, to set our other organs in motion. The will is necessarily determined by the quality and pleasantness of the ideas which act upon it. Deliberation is the oscillation of the will when moved in different directions by opposing forces; determination is the final prevalence of one force over the other. There is no difference between the man who throws himself out of a window and the man who is thrown out, except that the impulse on the latter comes from something outside of himself, and that of the former from something within his own mechanism. [Footnote: Chaudon, the Benedictine, probably the cleverest of the clerical writers of the time, thus attacks the doctrine of necessity, as set forth by Holbach. The author of the System has certainly given out very fine maxims of morality, very pathetic exhortations to virtue; but with his principles this can be but a joke. It is an absurdity, like that of a man who, recognizing that his watch was only a machine, should not fail to exhort it every day to prevent its getting out of order. Grosse, Diet. d'antiphilosophisme, 923. Holbach would probably have replied that he was necessarily obliged to exhort, and that Chaudon was fatally forced to answer.]

Nature has made men neither good nor bad; it has made them machines. Man is virtuous only in obedience to the call of interest. Morals are founded on our approbation of those actions which are advantageous to the race. When good actions benefit others and not ourselves our approbation of them is similar to the admiration we feel for a fine picture belonging to some one else. The good man is he whose true ideas have shown him that his happiness lies in a line of conduct which others are forced by their own interests to like and approve. By virtue we acquire the good will of our neighbors, and no man can be happy without it. Our self-love becomes a hundred times more delightful when to it is joined the love of others for us. Let us remember that the most impracticable of all designs is that of being happy alone.

To this point in his argument Holbach had only repeated with strength, clearness and consistency what the school of the Philosophers from Voltaire to Helvetius had either affirmed or hinted. In his second volume, however, he boldly cut loose from his predecessors and avowed his disbelief in any God. Voltaire and Rousseau were theists, with different sorts of faith, and the Philosophers, although treating all churches, and especially all priests, with contempt, had retained, at least in speech, some remnant of theism. But Holbach declared that God was an illusion, devised by the fears and the ignorance of mankind. "The idea of Divinity," he says, "always awakens afflicting ideas in our minds. "By the word "God" men mean the most hidden or remote cause; they use the word only when the chain of material and known causes ceases to be visible to them. It is a vague name which they apply to a cause short of which their indolence, or the limits of their knowledge, forces them to stop. Men found nature deaf to their cries; they therefore imagined an intelligent master over it, hoping that he would listen to them.

This theme is elaborated by Holbach throughout his second volume. Here as elsewhere he writes with seriousness and conviction, although some of his logical positions are assailable. Never before in France had materialism, necessarianism and atheism been so clearly and forcibly expounded. The very Philosophers were alarmed. Voltaire hastened to write an article on God so unconvincing, that it can hardly have convinced himself. It amounts to little more than an argument that God is the most probable of hypotheses, and it admits that there may be two or several gods as well as one. It is not unlikely that Voltaire thought it necessary for his peace in the world to protest against so outspoken a book as the "System of Nature."

The true answer to Holbach is to be found in a different order of ideas from any that Voltaire was prepared to accept. Yet Locke might have taught him that if there is no logical reason to believe in the existence of mind, there is as little to believe in the existence of matter. Experience might have shown him that men do not always seek the thing which they believe most useful to themselves. The old and favorite doctrine of utility labors under the disadvantage that it has never shown, nor ever can show, an adequate reason why any man should care for another or for the race. And as for the existence of God,—that can no more be proved by argument than the existence of matter, mind, or the non-ego.

Helvetius and Holbach had worked out the theories of the school to their last philosophical conclusion. A younger writer in the last years of the reign of Louis XV. was to furnish the complete application of them. The Chevalier de Chastellux is well known in America by the book of travels which he wrote when he accompanied the Marquis of Rochambeau in the Revolutionary War. Chastellux was just then at the height of his reputation. He had published in 1772 a book which, although now almost forgotten, is still interesting as a link between the thought of the last century and that of a large school of thinkers to-day. The title is "Of Public Felicity, or considerations on the fate of men in the different Epochs of History," and the motto is Nil Desperandum. "So many people have written the history of men," says Chastellux; "will not that of humanity be read with pleasure?" And again: "Several authors have carefully examined if such a Nation were more religious, more sober, more war-like than another; none has yet sought to discover which was the happiest."

The object of inquiry being thus indicated, it becomes of the first importance to consider what test of happiness Chastellux will propose. He leaves us in no doubt on this point. "A happy nation is not one which lives with little; the Goths and Vandals lived with little, and they sought abundance in other regions. A happy nation is not one which is hardened to trouble and labor; the Goths and Vandals were hardened to labor, and they sought elsewhere for softness and rest. A happy nation is not one which is strongest in battle; it fights only to obtain peace and the commodities of life. A happy nation is one which enjoys ease and liberty, which is attached to its possessions, and, above all things, which does not desire to change its condition." And in another place he asks, what are some of the indications, the symptoms of public felicity. Two of them, he says, are naturally presented: agriculture and population. "I name agriculture before population," he continues, "because if it happens that a nation which is not numerous cultivates carefully a great quantity of land, it will result that this nation consumes much, and adds to the food necessary to life the ease and commodity which make its happiness. If, on the other hand, the increase of the people is in proportion to that of the agriculture, what can we conclude except that this multiplication of the human race, as of all other species, comes solely from its well-being. Agriculture is, therefore, an indication of the happiness of the nations anterior and preferable to population." The most certain indication of felicity is a large proportional consumption of products; a high rate of living. The marvelous and even the sublime are to be dreaded; but "all that multiplies men in the nations, and harvests on the surface of the earth, is good in itself, is good above all things, and preferable to all that seems fine in the eyes of prejudice."[Footnote: Chastellux finds it hard to stick quite close to his definition of felicity. Of the English he says, "Such are the true advantages of this nation; which, joined to the safety of its property and the inestimable privilege of depending only on the law, would make it the happiest on earth, if its climate, its ancient manners and customs, and its frequent revolutions had not turned it toward discontent and melancholy. But these considerations do not belong to our subject." ii. 144.]

And as material good is the only good, so it is in modern times and in civilized countries that the highest point reached by humanity is to be found. "If wisdom be the art of happy living; if philosophy be truly the love of wisdom, as its name alone would give us to understand, the Greeks were never philosophers."

To show that modern nations are increasing the ease and comfort of life to a point unknown before is no difficult task. Chastellux enumerates the discoveries of physical science, and touches on the achievements of learning and the arts, then calls on his readers to look on all these but as payments on account in the progress of our knowledge; as so much of the road already passed in the vast course of the human mind. Here we have the truly modern ideal of progress; the end of government the greatest happiness of the greatest number, and happiness dependent merely on material conditions. Morals under this system are but a branch of medicine. Religion is an old-fashioned prejudice. Let us push on and unite the world in one great, comfortable, well-fed family. Such is the last practical advice of the French Philosophic school of the eighteenth century and of its unconscious followers in this. If the conclusion does not satisfy the highest aspirations of the human race, that is perhaps because of some flaw in the premises.