7 And the sons of the Eastern Church have every right to rejoice and take pride in this holy Father as one who is peculiarly and especially their own. For he is above all pre-eminent in those three qualities which have so greatly distinguished the other Fathers of the East: an outstanding sanctity of life, marked by a specially ardent devotion to the august Mother of God; exceptional learning, such that the Sacred Congregation of Rites, by a decree of the 28th July, 1882, declared him a Doctor of the Universal Church; and finally an energetic zeal in fearlessly repelling the attacks of heretics, in asserting the Catholic faith, and in defending and spreading the Gospel to the full extent of his power.
Source: Orientalis Ecclesiae (Vatican.va)