They wrote their consensus in the form of a creed, called the Creed of Nicea. In 381, another major council was held at Constantinople, at which the Creed of Nicea was expanded slightly to include a few more doctrines. The resulting Creed is called the Niceno-Constantinopolitan Creed, or more commonly, the Nicene Creed. They also developed a creed to explain what they believed to be true to the gospel, true to the apostolic teaching, and true to the Scriptures. This creed is called the Creed of Chalcedon.
Creeds can become formal, complex, abstract, and sometimes assumed as equal to Scripture.
When properly used, however, they facilitate a concise basis for teaching, safeguard correct biblical doctrine, and create a focus for church fellowship. These three creeds are widely accepted among Christians as consistent with the Bible and as statements of true Christian orthodoxy, or right teaching. He was conceived by the power of the Holy Spirit and born of the Virgin Mary. He suffered under Pontius Pilate, was crucified, died, and was buried. He descended to the dead.