a few moments, and the Indian wanders among his native spices without any sense of their exhalations. It is, indeed, not necessary to shew by many instances what all mankind confess, by an incessant call for variety, and restless pursuit of enjoyments, which they value only because unpossessed.
Something similar, or analogous, may be observed in effects produced immediately upon the mind; nothing can strongly strike or affect us, but what is rare or sudden. The most important events, when they become familiar, are no longer considered with wonder or solicitude, and that which at first filled up our whole attention, and left no place for any other thought, is soon thrust aside into some remote repository of the mind, and lies among other lumber of the memory, overlooked and neglected. Thus far the mind resembles the body, but here the similitude is at an end.
The manner in which external force acts upon the body is very little subject to the regulation of the will; no man can at pleasure obtund or invigorate his senses, prolong the agency of any impulse, or continue the presence of any image traced upon the eye, or any sound infused into the ear. But our ideas are more subjected to choice; we can call them before us, and command their stay, we can facilitate and promote their recurrence, we can either repress their intrusion or hasten their retreat. It is therefore the business of wisdom and virtue, to select among numberless objects striving for our notice, such as may enable us to exalt our reason, extend our views, and secure our happiness. But this choice is to be made with very little regard to rareness or frequency; for nothing is valuable merely because it is either rare or common, but because it is adapted
