While there is no firmly set, single style for the essayist, styles varying with each particular essayist, the best general description of essayistic style was written in 1827 by William Hazlitt in his essay "Familiar Style." "To write a genuine familiar or truly English style," Hazlitt wrote, "is to write as any one would speak in common conversation who had a thorough command and choice of words, who could discourse with ease, force, and perspicuity, setting aside all pedantic and oratorical flourishes." The style of the essayist is that of an extremely intelligent, highly common-sensical person talking, without stammer and with impressive coherence, to him- or herself and to anyone else who cares to eavesdrop. This self-reflexivity, this notion of talking to oneself, has always seemed to me to mark the essay off from the lecture. The lecturer is always teaching; so, too, frequently is the critic. If the essayist does so, it is usually only indirectly.
Joseph Epstein, “Introduction,” in Joseph Epstein, ed., The Best American Essays 1993 (New York: Ticknor & Fields, 1993), pp. xvi.