"On a Forgotten Kind of Writing," Chicago Review, Vol. 8, No. 1 (Winter-Spring 1954). Reprinted in What Is Political Philosophy?
In studying certain earlier thinkers, I became aware of this way of conceiving the relation between the quest for truth (philosophy or science) and society: Philosophy or science, the highest activity of man, is the attempt to replace opinion about “all things” by knowledge of “all things”; but opinion is the element of society; philosophy or science is therefore the attempt to dissolve the element in which society breathes, and thus it endangers society. Hence philosophy or science must remain the preserve of a small minority, and philosophers or scientists must respect the opinions on which society rests. To respect opinions is something entirely different from accepting them as true. Philosophers or scientists who hold this view about the relation of philosophy or science and society are driven to employ a peculiar manner of writing which would enable them to reveal what they regard as the truth to the few, without endangering the unqualified commitment of the many to the opinions on which society rests. They will distinguish between the true teaching as the esoteric teaching and the socially useful teaching as the exoteric teaching; whereas the exoteric teaching is meant to be easily accessible to every reader, the esoteric teaching discloses itself only to very careful and well-trained readers after long and concentrated study.