To show, indeed, how little there is of the _extempore_, the hap-hazard, the hit-or-miss, in the character of creative thought, and how completely the gladdest inspiration is earned, let us glance at the psychological history of one of those imperial ideas which measure the power, test the quality, and convey the life, of the minds that conceive them. The progress of such an idea is from film to form. It has its origin in an atmosphere of feeling; for the first vital movement of the mind is emotional, and is expressed in a dim tendency, a feeble feeling after the object, or the class of objects, related to the peculiar constitution and latent affinities of its individual being. This tendency gradually condenses and deepens into a sentiment, pervading the man with a love of those objects,--by a sweet compulsion ordering his energies in their direction,--and by slow degrees investing them, through a process of imagination, with the attribute of beauty, and, through a process of reason, investing the purpose with which he pursues them with the attribute of intelligence. The object dilates as the mind assimilates and the nature moves, so that every step in this advance from mere emotion to vivid insight is a building up of the faculties which each onward movement evokes and exercises,--sentiment, imagination, reason increasing their power and enlarging their scope with each impetus that speeds them on to their bright and beckoning goal. Then, when the individual has reached his full mental stature, and come in direct contact with the object, then, only then, does he "pluck out the heart of its mystery" in one of those lightning-like _acts_ of thought which we call combination, invention, discovery. There is no luck, no accident, in all this. Nature does not capriciously scatter her secrets as golden gifts to lazy pets and luxurious darlings, but imposes tasks when she presents opportunities, and uplifts him whom she would inform. The apple that she drops at the feet of Newton is but a coy invitation to follow her to the stars.