The Nicene Creed says: “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.”
Trinity is the unity of essence, form, and function.
Essence is the Holy Spirit.Function is the function of essence - that is, creating all things. Function refers to the Father.Form is the manifestation of the function of essence, and refers to all things in the world.