Five senses, then, to gather a small part of the infinite influences that vibrate in Nature, a moderate power of understanding to interpret those senses, and an irregular, passionate fancy to overlay that interpretation--such is the endowment of the human mind. And what is its ambition? Nothing less than to construct a picture of all reality, to comprehend its own origin and that of the universe, to discover the laws of both and prophesy their destiny. Is not the disproportion enormous? Are not confusions and profound contradictions to be looked for in an attempt to build so much out of so little? Yet the metaphysical ambition we speak of cannot be abandoned, because whatever picture of things we may carry about in our heads we are bound to regard as a map of reality; although we may mark certain tracts of it "unexplored country," the very existence of such regions is vouched for only by our representation, and is necessarily believed to correspond to our idea. All we can do is, without abandoning the aspiration to knowledge which is the inalienable birthright of reason, to control as best we may the formation of our conceptions; to arrange them according to their derivation and measure them by their applicability in life, so prudently watching over their growth that we may be spared the deepest of sorrows--to survive the offspring of our own thought. The inadequacy of each of our faculties is what occasions the intrusion of some other faculty into its field. The defect of sense calls in imagination, the defect of imagination calls in reasoning, the defect of reasoning divination. If our senses were clairvoyant and able to observe all that is going on in the world, if our instincts were steady, prompting us to adequate reactions upon these observations, the fancy might remain free. We should not need to call upon it to piece out the imperfections of sense and reflection, but we should employ it only in avowed poetry, only in building dream-worlds alongside of the real, not interfering with the latter or confusing it, but repeating its pattern with as many variations as the fertility of our minds could supply. As it is, the imagination is brought into the service of sense and instinct, and made to do the work of intelligence. This substitution is the more readily effected, in that imagination and intelligence do not differ in their origin, but only in their validity. Understanding is an applicable fiction, a kind of wit with a practical use. Common sense and science live in a world of expurgated mythology, such as Plato wished his poets to compose, a world where the objects are imaginative in their origin and essence, but useful, abstract, and beneficent in their suggestions. The sphere of common sense and science is concentric with the sphere of fancy; both move in virtue of the same imaginative impulses. The eventual distinction between intelligence and imagination is ideal; it arises when we discriminate various functions