And those who say "there once was when he was not", and "before he was begotten he was not", and that he came to be from things that were not, or from another hypostasis, or substance, affirming that the Son of God is subject to change or alteration, these the Catholic and Apostolic Church anathematises. (Condemnations of the Council of Nicea)
"The word of the Lord of the 318 Fathers at Nicea stands forever." (St. Athanasius)
"Rejoic[e] then in these successes and in the common peace and harmony and in the cutting off of all heresy ... Pray for us all that our decisions may remain secure through Almighty God and our Lord Jesus Christ in the Holy Spirit, to whom is the glory for ever and ever. Amen." (The Letter of the Council of Nicea to the Egpytians)