Although several Orthodox theologians have significantly enhanced the development of Ecclesiology in the twentieth century, the contribution of Archbishop Stylianos Harkianakis, Primate of the greek Orthodox CHurch in Austrlia, remains, without doubt, a landmark in the history of that theological field today. Essentially the authors consideration of the Church is that it is the most intimate and graced communion not only of human persons but of the entire created cosmos bonded together in a wondrous relationship with the uncreated God. Unconfusedly and indivisibly united with God, the Church therefore enjoys and rightly proclaims the truth - ie it is infallible - for the world's salvation and the glorification of God. Ultimately his the author's theology of the Church's infallibility, ie it's truthfulness, is simply a donological affirmation of the genuine presence of God among his people and the world at large.