There are things which can never be more than approximately defined, and which, even when so defined, are only to be rightly understood in proportion to the degrees in which they are possessed by those who would attempt to comprehend them. Such are, for example, “imagination” and “genius”; which, being faculties that are possessed in a very low degree by nearly all and in a very high degree by extremely few, are matters of the most general interest and the most variable apprehension. That such faculties should, however, as far as possible, be understood is of great practical importance to all persons; inasmuch as it greatly concerns all to know something of the signs, sanctions, and claims of those powers by which they are inevitably more or less ruled, externally and internally.

It is nothing against a definition of an entity{44} which cannot be fully defined to say that such definition is “new.” It was objected against an interpretation by St. Augustine of some Old Testament history or parable, that other authorities had given other interpretations. “The more interpretations the better,” was the saint’s reply. In such cases various definitions and interpretations are merely apprehensions of various sides of a matter not wholly to be embraced or comprehended by any single definition or interpretation. In recent times genius and imagination have come to be widely regarded as one and the same thing. They are not so, however, though they are perhaps indissolubly connected. The most peculiar and characteristic mark of genius is insight into subjects which are dark to ordinary vision and for which ordinary language has no adequate expression. Imagination is rather the language of genius: the power which traverses at a single glance the whole external universe, and seizes on the likenesses and images, and their combinations, which are best able to embody ideas and feelings which are otherwise inexpressible; so that the “things which are unseen are known by the things which are seen.” Imagination, in its higher developments, is so quick and subtle a power that the most delicate analysis can scarcely follow its shortest flights. Coleridge said that it would{45} take a whole volume to analyse the effect of a certain passage of only a few syllables in length. In dealing with such a work as The Tempest criticism is absolutely helpless, and its noblest function is to declare its own helplessness by directing attention to beauty beyond beauty which defies analysis. The Tempest, like all very great works of art, is the shortest and simplest, and indeed the only possible expression of its “idea.” The idea is the product of genius proper; the expression is the work of imagination. There are cases, however, in which it is hard to distinguish at all between these inseparable qualities. The initiation of a scientific theory seems often to have been due to the action of the imagination working independently of any peculiar direct insight; the analogy-discovering faculty—that is, the imagination—finding a law for a whole sphere of unexplained phenomena in the likeness of such phenomena to others of a different sphere of which the law is known. Hence the real discoverers of such theories are scarcely ever those who have obtained the credit of them; for nothing is usually more abhorrent to men of extraordinary imagination than “fact-grinding.” Such men, after having flung out their discoveries to the contempt or neglect of their contemporaries, leave the future proof of them to mental mechanics; religiously{46} avoiding such work themselves, lest, as Goethe said of himself, they should find the............