The Nicene Creed, 325

We believe in one God, the Father almighty, creator of all things both visible and invisible. And in one Lord Jesus Christ, the Son of God, the only-begotten born of the Father, that is, of the substance of the Father; God from God, light from light, true God from true God; begotten, not created, consubstantial with the Father; through him all things were made, those in heaven and those on earth as well. For the sake of us men and for our salvation, he came down, was made flesh, and became man; he suffered and on the third day arose; he ascended into heaven and is going to come to judge the living and the dead. And we believe in the Holy Spirit.

As for those who say: "There was a time when he did not exist"; and, "Before he was begotten, he did not exist"; and, "He was made from nothing, or from another hypostasis or essence," alleging that the Son of God is mutable or subject to change -- such persons the catholic and apostolic Church condemns.