First Council of Nicaea

=== Anathemas ===
At the end of the creed came a list of [[Anathema#Early Church|anathemas]], designed to repudiate explicitly the Arians' stated claims.

# The view that "there was once when he was not" was rejected to maintain the coeternity of the Son with the Father.
# The view that he was "mutable or subject to change" was rejected to maintain that the Son just like the Father was beyond any form of weakness or corruptibility, and most importantly that he could not fall away from absolute moral perfection.

Thus, instead of a baptismal creed acceptable to both the Arians and their opponents, the Council promulgated one which was clearly opposed to Arianism and incompatible with the distinctive core of their beliefs. The text of this profession of faith is preserved in a letter of Eusebius to his congregation, in Athanasius' works, and elsewhere. The [[Homoousian]]s (from the [[Koine Greek]] word translated as "of same substance" which was condemned at the Council of Antioch in 264–268) were the most vocal of anti-Arians and were able to advance the use of the term, thus the creed was accepted by the Council.