athanasius creed
That we worship one God in trinity and the trinity in unity, neither blending their persons nor dividing their essence. For the person of the Father is a distinct person, the person of the Son is another,
and that of the Holy Spirit still another.
But the divinity of the Father, Son, and Holy Spirit is one, their glory equal, their majesty coeternal.
What quality the Father has, the Son has, and the Holy Spirit has. The Father is uncreated, the Son is uncreated, the Holy Spirit is uncreated.
The Father is immeasurable, the Son is immeasurable, the Holy Spirit is immeasurable.
The Father is eternal, the Son is eternal,
the Holy Spirit is eternal.