Imagination, where it is truly creative, is a faculty, and not a quality; it looks before and after, it gives the form that makes all the parts work together harmoniously toward a given end, its seat is in the higher reason, and it is efficient only as a servant of the will. Imagination, as it is too often misunderstood, is mere fantasy, the image-making power, common to all who have the gift of dreams.

Among My Books (ed. 1870)