This creed was first formulated at the First Ecumenical Council held at Nicea--located in what is now Turkey--in 325 as a response to the Arian heresy, which denied the divinity of Christ. It was revised at the Second Ecumenical Council, held at Constantinople in 381 as a response to the Macedonian or Pneumatomachian heresy, which denied the divinity of the Holy Spirit.
We believe in one God, the Father, the Almighty, maker of heaven and earth, of all that is, seen and unseen.
We believe in one Lord, Jesus Christ, the only Son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, of one Being with the Father. Through him all things were made. For us and for our salvation he came down from heaven: by the power of the Holy Spirit he became incarnate from the Virgin Mary, and was made man. For our sake he was crucified under Pontius Pilate; he suffered death and was buried. On the third day he rose again in accordance with the Scriptures; he ascended into heaven and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead, and his kingdom will have no end.
We believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father. With the Father and the Son he is worshiped and glorified. He has spoken through the Prophets. We believe in one holy catholic and apostolic Church. We acknowledge one baptism for the forgiveness of sins. We look for the resurrection of the dead, and the life of the world to come. Amen.
Note: The word "catholic" with a lower case 'c' does not mean the Roman Catholic Church but the universal Christian Church as a whole.