This is interesting, something worth while to look into. I believe what they're saying is that they are three separate gods who are one through essence. Lets look up the greek word for essence and see what it says.This 325 AD Creed also uses a terminology to signify something unique within God, they called it the [Same Essence]. What do you believe they were implying by saying God is the [Same Essence] between the Godhead?
The generally agreed-upon meaning of ousia in Eastern Christianity is "all that subsists by itself and which has not its being in another" – in contrast to hypostasis, which is used to mean "reality" or "existence".
