Literature is one of those spheres of human activity that is both marginal and inconceivable, because its theory is entangled in biology and — author’s and reader’s — psychology, in their sociology, in the theory of organization and information, aesthetics, epistemology, cultural anthropology, and so on. One can therefore proceed in two ways: either scientifically i.e. rationally by announcing what belongs to the theory of literature in the strict sense while in all entangled issues by referring to the relevant sciences. Or foolishly, by trying to find out ”everything" related to literature on one’s own, within the volume of one book written by one man.