St. Maximus the Confessor ca. 580-662
“Neither Greek nor Jew.” This refers to a difference, or more properly a contradiction, in opinions about God. The Greek notion foolishly introduces a multiplicity of principles and divides the single principle into contrary energies and forces. It fashions a polytheist cult which becomes factious by reason of the multitude of its objects and ludicrous because of the various ways of veneration. The Jewish notion introduces a single principle but one which is petty and imperfect, almost impersonal as deprived of reason and life. Through opposite ways it results in the same evil as the first notion, a disbelief in the true God. It limits to a single person the one principle which would subsist without the Word and the Spirit, or which would be qualified by the Word and the Spirit. It does not see what God would be if He had no part with the Word and Spirit, nor how He would be God in having part with them as if they were accidents, by a participation close to that of rational beings subject to generation. In Christ, as I have said, there is none of these things, but only the reality of genuine piety, a steadfast law of mystical theology which rejects any expansion of the divinity as the first notion does, while not allowing any contraction as does the second. Thus there is no dissension by a plurality of natures, the Greek error, nor an affirmation of the oneness of hypostasis, the Jewish error, because being deprived of the Word and the Spirit or qualified by the Word and the Spirit, God is not honored as Mind, Word, and Spirit. This teaches us, who have been introduced to the perfect knowledge of truth by a calling of grace in faith, to recognize that the nature and the power of the divinity is one, and therefore that there is one God contemplated in the Father, Son and Holy Spirit.
…In this way polytheism is not introduced by division, nor atheism by confusion. By avoiding both, the understanding of God in the light of Christ shines forth. I call Christ’s understanding the new proclamation of truth… “neither Jew nor Greek,” that is, no conception opposed to God; “neither circumcision nor uncircumcision,” that is, no different religions issued from these opposed conceptions… Both of these together end up at the same evil, insolence against God. (Commentary on the Our Father)