To classify is, indeed, as useful as it is natural. The indefinite multitude of particular and changing events is met by the mind with acts of defining, inventorying and listing, reducing the common heads and tying up in bunches. But these acts like other intelligent acts are performed for a purpose, and the accomplishment of purpose is their only justification. Speaking generally, the purpose is to facilitate our dealing with unique individuals and changing events. When we assume that our clefts and bunches represent fixed separations and collections in rerum natura, we obstruct rather than aid our transactions with things. We are guilty of a presumption which nature promptly punishes. We are rendered incompetent to deal effectively with the delicacies and novelties of nature and life. Our thought is hard where facts are mobile ; bunched and chunky where events are fluid, dissolving.

Dewey (1957), p. 131.

Dewey, J. (1957). Human nature and conduct. New York: Modern Library. Retrieved from