In the mind of Gregory, the Orthodox doctrine of the Blessed Trinity is the fundamental dogma of Christianity, in contrast with all other religions, and with all heretical systems.  “Remember your confession,” he says to his hearers in an Oration against the Arians; “Into what were you baptized?  The Father?  Good, but still Jewish.  The Son?  Good; no longer Jewish, but not yet perfect.  The Holy Ghost?  Very good; this is perfect.  Was it then simply into these, or was there some one common Name of these?  Yes, there was, and it is God.”  And in the same oration he calls Arianism a new Judaism, because it ascribes full Deity only to the Father; and he speaks of One Nature in Three Individualities, intelligent, perfect, self-existent, distinct numerically, but one in Godhead.  “In created things,” says Ullmann, “the several individuals are embraced in a common conception, though in themselves only connected together in thought, while in fact they are not one.  Manhood is only an intellectual conception; in fact there exist only Men.  But in the Godhead the Three Persons are not only in conception, but in fact, One; and this Unity is not only a relative but an absolute Unity, because the Divine Being is perfect in all Three Persons, and in all in a perfect equality.  In this sense therefore Gregory and all orthodox Trinitarians maintain the Unity of God.  But within this Unity there is a true Trinity, Father, Son, and Holy Ghost, a Trinity of Persons in a Unity of Nature.”  We worship, he says (Or. xxxiii. 16), the Father, Son, and Holy Ghost, One Nature in Three Individualities.  So that, as he says elsewhere (Or. in laud. Athanasii, xxi. 10), the Trinity is a true Trinity; not a numbering of unlike things, but a binding together of equals.  Each of the Persons is God in the fullest sense.  The Son and the Holy Ghost have their Source of Being in the Father, but in such sense that They are fully consubstantial with Him, and that neither of Them differs from Him in any particular of Essence.  The points of difference lie in the Personal Attributes; the Father Unoriginate, and Source of Deity; the Son deriving His Being eternally from the Father, and Himself the Source of all created existence; the Holy Ghost proceeding eternally from God, and sent into the world.