Quotation by Daniel J. Boorstin

There is a wonderful, but neglected precision in these words. The old English noun "travel" (in the sense of a journey) was originally the same word as "travail" (meaning "trouble," "work," or "torment").... Significantly, too, the word "tour" in "tourist" was derived by back-formation from the Latin "tornus," which in turn came from the Greek word for a tool describing a circle. The traveler, then was working at something; the tourist was a pleasure-seeker. The traveler was active; he went strenuously in search of people, of adventure, of experience. The tourist is passive; he expects interesting things to happen to him.