[Kolokotronis]

"There is nothing more simple and indivisible than God, our reality notwithstanding."

Thus?:

"Trinity is simple unity; it is not merged together - it is three in one. The One three-hypostatical God has the three hypostases perfectly distinct in Himself." +Gregory of Sinai

But then:

"You ask what is the procession of the Holy Spirit? Do you tell me first what is the unbegottenness of the Father, and I will then explain to you the physiology of the generation of the Son, and the procession of the Spirit, and we shall both of us be stricken with madness for prying into the mystery of God." +Gregory the Theologian

[kosta50]

We, therefore, both know and confess that God is without beginning, without end, eternal and everlasting, uncreate, unchangeable, invariable, simple, uncompound, incorporeal, invisible, impalpable, uncircumscribed, infinite, incognisable, indefinable, incomprehensible, good, just, maker of all things created, almighty, all-ruling, all-surveying, of all overseer, sovereign, judge; and that God is One, that is to say, one essences; and that He is known(4), and has His being in three subsistences... [+John of Damascus, Book I, Ch. II]