Editing Trinity (section)

=== First Council of Constantinople (381) ===
{{Main|First Council of Constantinople}}
Later, at the [[First Council of Constantinople]] (381), the Nicene Creed would be expanded, known as Niceno-Constantinopolitan Creed, by saying that the Holy Spirit is worshiped and glorified together with the Father and the Son ({{lang|grc|συμπροσκυνούμενον καὶ συνδοξαζόμενον}}), suggesting that he was also consubstantial with them:

{{blockquote|We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible. And in one Lord Jesus Christ, the only-begotten Son of God, begotten of the Father before all worlds (æons), Light of Light, very God of very God, begotten, not made, being of one substance with the Father; ... And in the Holy Ghost, the Lord and Giver of life, who proceedeth from the Father, who with the Father and the Son together is worshiped and glorified, who spake by the prophets ...<ref>See [http://www.ccel.org/ccel/schaff/creeds1.iv.iii.html Creeds of Christendom] {{Webarchive|url=https://web.archive.org/web/20031206143317/http://www.ccel.org/ccel/schaff/creeds1.iv.iii.html |date=6 December 2003 }}.</ref>}}

The doctrine of the divinity and personality of the Holy Spirit was developed by Athanasius in the last decades of his life.{{sfn|Hornblower|Spawforth|Eidinow|2012|p=193}} He defended and refined the Nicene formula.<ref name="BEoWR" /> By the end of the 4th century, under the leadership of [[Basil of Caesarea]], [[Gregory of Nyssa]], and [[Gregory of Nazianzus]] (the [[Cappadocian Fathers]]), the doctrine had reached substantially its current form.<ref name="BEoWR" />