Epiphanius Ancoratus 7

Indeed, the Spirit is the Holy Spirit, and the Son is the Son. But the Spirit comes forth from the Father and He takes from the Son, seeks out the depths of God and to declare to us the Word of the Son. The Spirit is in the world as the Sanctifier of the saints by means of the Trinity, the third in name, ie Father, Son and Holy Spirit, for it says, Go forth and baptise in the name of the Father and of the Son and of the Holy Spirit (Matt. 28.19). It is the mark of grace, it is the Triune bond of union, not foreign in number, not separate from the name, not foreign to the gift, but one God, one faith, one Lord, one grace, one church, one baptism. For the Trinity is always the Trinity. It never receives any addition but is counted in this way: Father, Son and Holy Spirit.  The Trinity is not a confusion or merging of identities, nor is it divided or different in itself from its own unity but is in real perfect existence, the Father is perfect, the Son is perfect and the Holy Spirit is perfect: Father and Son and Holy Spirit. Now back again to the Spirit who has arranged the gifts in this way: Now there are varieties of gifts, but the same Spirit. And there are varieties of ministries, and the same Lord. There are varieties of effects, but the same God who works all things in all persons (1Cor 12.4-6). Now there is no backing away from what is set before us. Do not desert the truth. We do not advocate for the sake of God but we think in a Godly way in order that we are not lost. We speak loudly and clearly what we have laid hold of and, as men, we speak loudly and clearly what we are able to grasp. The honour in God is boundless and without limit and is ten thousand times more than what we can comprehend or imagine and nothing can take away His glory and uniqueness. For there is nothing in the Trinity that has been created or added onto. But the Father begets the Son and there never was a time when the Son did not exist. There was never a time when the Father was not called the Father but was always the Father, and the Son was always the Son, not a brother. The Son is begotten inexplicably and being named incomprehensibly. He is always together with the Father and at no point in time did He cease to exist. The Father is unbegotten, uncreated and beyond comprehension. The Son is Begotten but both uncreated and beyond comprehension.  The Holy Spirit is always, not begotten, not created, not a brother, not an uncle nor an ancestor, not a descendant. The Holy Spirit is from out of the very Being of the Father and the Son. God is Spirit.