A powerful agent is the right word: it lights the reader’s way and makes it plain; a close approximation to it will answer, and much traveling is done in a well-enough fashion by its help, but we do not welcome it and applaud it and rejoice in it as we do when the right one blazes out on us. Whenever we come upon one of those intensely right words in a book or a newspaper the resulting effect is physical as well as spiritual, and electrically prompt: it tingles exquisitely around through the walls of the mouth and tastes as tart and crisp and good as the autumn-butter that creams the sumac-berry.

Mark Twain