The constitutional difference between one man and another is to be traced, in great measure, to the quality and vigor of the imagination. Thus it will be found that eminently active and energetic spirits are peculiarly susceptible to those natural exaggerations by which the mind enhances the value of whatever it pursues. At the same time an efficient energy implies always the power of control over such impressions. Yet it is enough that these creations of fancy should be under the command of reason; for good sense by no means demands a rigid scrutiny into the composition or mechanism of common motives, or asks that whatever is not absolutely substantial in the objects of desire should be spurned. He who is not too wise to be happy, leaves the machinery of human nature to accomplish its revolutions unexplored, and is content to hold the mastery over its movements. Whoever, instead of simply repressing the irregularities of the imagination, and forbidding its predominance, would altogether exclude its influence, must either sink far below the common level of humanity, or rise much above it. * * * * * The excesses of the imagination are of two kinds; the first is when, within its proper sphere, it gains so great a power that every other affection and motive belonging to human nature is overborne and excluded. It is thus that intellectual or professional pursuits seems sometimes to annihilate all sympathy with the common interests of life, and to render man a mere phantom, except within the particular circle of his favorite objects. The second kind of excess (one species of which forms the subject of the present work) is of much more evil tendency, and consists in a trespass of the imagination upon ground where it should have little or no influence, and where it can only prevent or disturb the operation of reason and right feeling. Thus, not seldom, it is seen that, on the walks of common life, the sobrieties of good sense, and the counsels of experience, and the obvious motives of interest, and perhaps even the dictates of rectitude, are set at naught by some fiction of an exorbitant imagination, which, overstepping its proper function, invests even the most ordinary objects, either with preposterous charms or with unreal deformities.