No doubt social progress, as a whole, has required and does require for its production intellectual powers of the highest and rarest kind. The point here insisted on is that it is not produced by intellectual powers alone, and that intellectual powers alone would be quite unable to produce it. Thus the sorrows and disappointments of the unfortunate inventor are proverbial; and the reason is that great inventive powers are frequently accompanied by a very feeble will and a fantastic ignorance of the world; the inventor, though strong as a mind, being pitiably weak as a man. He can do everything with his inventions except make them useful to anybody. He might be practically far greater were he to lose some of his intellectual powers, could he thereby develop some of the humbler qualities in which he is wanting. As it is, he resembles a chronometer which is without a main-spring, and which is useless when compared with a ten-and-sixpenny watch. Hence the inventor has so frequently to ally himself with the man of {126} enterprise, and only becomes great, as a social force, by doing so. Such unions are often sufficiently strange in appearance. We see some man whose intellect is the finest machine imaginable, but he is only redeemed from absolute and grotesque uselessness by his partner, who is little better than an inspired bagman. But such a bagman’s gifts, however the inefficient theorist may despise them, are, though less striking than the inventor’s, often quite as rare. No doubt many great inventors have the practical gifts as well as the intellectual, and their greatness, in such cases, is comprehended completely in themselves. It remains, however, an equally composite thing, no matter whether it takes two men or only one to complete it; and exceptional intellect is only one of its elements. The other qualities with which it requires to be allied, and which alone give it its practical value, such as determination, shrewdness, and a certain thickness of skin, though often remarkable individually for the exceptional degree to which they are developed, just as often unite to produce practical greatness, not because of the exceptional degree to which they are developed, but of the exceptional proportions in which they are combined. Some of the most essential of them, indeed, need not be exceptional at all, except from the fact of their association with others that are so. Much greatness, for instance, of the most powerful kind, consists mainly of very ordinary sense in conjunction with extraordinary energy; and energy is often, as has already been pointed out, in proportion {127} to the narrowness rather than to the width of the imagination.