Epiphanius Ancoratus Chapter 67

(1) If Christ is believed [to be] from the Father, as God from God, and the Spirit [is] from Christ or from both (as Christ says, “who proceeds from the Father,” and “this one will receive what is mine”; and Christ from the Holy Spirit, “for that which is in her, the voice of the angel says,” is from the Holy Spirit”), I should understand the mystery that delivers me by faith, by hearing alone, by love for the one who came to me.

(2) For God knows himself; Christ proclaims himself; the Holy Spirit manifests himself to the saints. In the Holy Scriptures the Trinity is proclaimed to us and is believed simply, without strife <from> a hearing of that which has been agreed.

(3) From this faith is the salvation of grace, “righteousness from faith apart from works of the law”: <for> it has been written that from the “hearing of faith,” the “Spirit of Christ” is given to those who are saved.

(4) This very faith is indicated in general by the expressions of the heralds, as I myself believe, being instructed from the Scriptures: thrice holy, thrice equally holy, thrice existent, thrice coexistent, thrice endowed with form, thrice with equal form, thrice active, thrice co-active, thrice enhypostatic, thrice with hypostasis joined with one another. The Trinity is called holy, being three, one concord, one divinity of the same ousia, of the same divinity, of the same hypostasis, like from like, working an equality of grace of Father and of Son and of Holy Spirit.

(5) And how to teach to others is left open [to God]. “For no one knows the Father except the Son, nor the Son except the Father and to whom the Son might reveal.” And he reveals through the Holy Spirit.

(6) Accordingly, these being three, whether of him or from him or with him, for each, are they being thought about worthily, even as he reveals them as light, fire, wind, and I believe with other likenesses of visions, as the man being supplied is worthy.

(7) Therefore, God Himself, the one who said in the beginning, “Let there be light, and light came to be,” which was visible, is the same as the one who illuminated us to see “the light,” “the true one, who comes into the world, illuminating all men.” (“Send your light and your truth,” says David.) He is the same Lord who said, “In the final days I will pour out my Spirit upon all flesh, and their sons and daughters will prophesy, and their youths will see visions,” showing us three Persons of holy worship, for a hypostasis which is threefold.