It is this God alone - Father, Son and Holy Spirit - that we confess, the God Who was manifested on the day of the Baptism of the Lord, at Holy Theophany, when the worship of the Trinity was made manifest, as the Dismissal Hymn of the Feast says. What was revealed on that day is what we confess in the Church of Christ. As St. Gregory the Theologian says:
When I say God, I mean the Father, the Son and the Holy Spirit, without extending the Godhead beyond this number of persons, for fear of introducing a plurality of Gods, and without restricting Him to a smaller number, for fear of being accused of diminishing the Godhead; by admitting only one principle, I would fall into Judaism, and by admitting several, into paganism.
We confess the three persons or hypostases of the Holy Trinity, the only God. Since their divine essence or nature is one, the three hypostases, the Father, the Son and the Holy Spirit possess all in common, except their personal or hypostatic properties:
- the property that distinguishes the Father is that He is unbegotten;
- the property that distinguishes the Son is that He is begotten of the Father;
- the property that distinguishes the Spirit is that He proceeds from the Father.
As St. Gregory the Theologian says:
What is common to the Father, to the Son and to the Holy Spirit is the divinity or uncreated nature. (What is common to the Son and to the Holy Spirit is to have their origin form the Father.) The attribute proper to the Father is to be unbegotten, generation is proper to the Son and procession is proper to the Holy Spirit.
Likewise St. John Damascene says:
The Father, the Son and the Holy Spirit are one in all things, except for being unbegotten, for being begotten and for proceeding. The three hypostases differ from one another merely in these personal properties, but not in their essence.
Our knowledge, therefore, is a very limited one. Very little has been revealed about the eternal existence of the Holy Trinity because very little knowledge is necessary for our salvation. And even what has been revealed remains incomprehensible to us, for, as the Prophet Esaias says: Who shall declare his generation? (Es. 53,8). The divine essence is totally unknowable not only to us, but even to the Holy Angels. We only know that God’s uncreated energies, namely, Love, Will, Righteousness, and so forth, which are common to the Father, the Son and the Holy Spirit, are infused into those who have prepared themselves to receive them, as much as they can endure, according to the economy of our salvation, in the Church of Christ, by participating in the Holy Mysteries and living the life in Christ.
Therefore, we confess the genuine Trinity that has revealed Himself - Father, Son and Holy Spirit; they are One distinctly and distinct jointly, St. Gregory the Theologian says, and he adds: however paradoxical this phrase may be, in order to show the revealed nature of this mystery, which is incomprehensible to human reason.
Also we Orthodox believe that many saint works were forged by the Latins in order to support Filioque. We claimed it in 9th century during saint patriarch Photius, we claimed it in Flroence in 15th century, and we still claim it.