The Church’s Apostolicity Karl Barth has rightly stated that to be “apostolic” means to be “in the discipleship, in the school, under the normative authority, instruction and direction of the apostles, in agreement with them, because listening to them and accepting their message.”10 Accordingly, apostolicity must be primarily concerned with faithful adherence to the doctrine of the apostles, which was communicated to them by supernatural revelation and inscripturated through them by supernatural