Manufactures, shipping, labour--all have for end the general, the public good; to create useless industries, to favour superfluous conveyances, to support a greater amount of labour than is necessary, not for the good of the public, but at the expense of the public--is to realize a true _petitio principii_. It is not labour which is desirable for its own sake; it is consumption. All labour without a commensurate result is a loss. You may as well pay sailors for pitching stones into the sea as pay them for transporting useless refuse. Thus, we arrive at the result to which all economic sophisms, numerous as they are, conduct us, namely, confounding the means with the end, and developing the one at the expense of the other. XXII. METAPHORS. A sophism sometimes expands, and runs through the whole texture of a long and elaborate theory. More frequently, it shrinks and contracts, assumes the guise of a principle, and lurks in a word or a phrase. May God protect us from the devil and from metaphors! was the exclamation of Paul-Louis. And it is difficult to say which of them has done most mischief in this world of ours. The devil, you will say; for he has put the spirit of plunder into all our hearts. True, but he has left free the means of repressing abuses by the resistance of those who suffer from them. It is the sophism which paralyzes this resistance. The sword which malice puts into the hands of assailants would be powerless, did sophistry not break the buckler which should shield the party assailed. It was with reason, therefore, that Malebranche inscribed on the title-page of his work this sentence: _L'erreur est la cause de la misère des hommes_. Let us see in what way this takes place. Ambitious men are often actuated by sinister and wicked intentions; their design, for example, may be to implant in the public mind the germ of international hatred. This fatal germ may develop itself, light up a general conflagration, arrest civilization, cause torrents of blood to be shed, and bring upon the country the most terrible of all scourges, invasion. At any rate, and apart from this, such sentiments of hatred lower us in the estimation of other nations, and force Frenchmen who retain any sense of justice to blush for their country. These are undoubtedly most serious evils; and to guard the public against the underhand practices of those who would expose the country to such hazard, it is only necessary to see clearly into their designs. How do they manage to conceal them? By the use of metaphors. They twist, distort, and pervert the meaning of three or four words, and the thing is done. The word _invasion_ itself is a good illustration of this.