Theodoret: The faith of the Apostles

“I HAVE ever kept the faith of the Apostles undefiled…. So have I learnt not only from the Apostles and the prophets but also from the interpreters of their writings, Ignatius, Eustathius, Athanasius, Basil, Gregory, John and the rest of the lights of the world; and before these from the holy Fathers in council at Nicaea, whose confession of faith I preserve in its integrity, like an ancestral heritage styling corrupt and enemies if the truth all who dare to transgress its decrees.”

~Theodoret (Bishop of Cyrus and theologian, 393 — c. 457): Letters, No. 89; To Florentius, a patrician.

Eastern Orthodox icon depicting the First Council of Nicaea.