Luke’s narrative points out the main characteristics of the NT authors’ writing activity which is better seen from a communicative viewpoint. The now dominating approach introduces the picture of the NT authors’ literary activity as not-normalized, showing rather ambiguous features: 1) an impulsiveness and spontaneity; 2) a poor acquaintance with the verbal clichés of the language which they wrote in; 3) inadequate relations between the authors and the audience; 4) absence of a literary tradition to which the authors ascribed themselves. Based on Luke’s case, three general reasons for the communicative vacuum can be stated as follow: a structural (Saussurian) methodology of linguistic research, the theory of bilingualism uncritically applied, little attention paid to the audience of the NT texts. The Diaspora Greek-speaking tradition is regarded as a territory of convention among its participants where Semitisms could not exist as “mistakes.” More correct evaluation of Luke’s (and other NT authors’) linguistic phenomena is possible through research of authentic Diaspora communication factors.