Basil of Caesarea

Where are those who set at naught the Spirit? Where are those who separate it from the creative power? Where are those who dissever it from union with the Father and Son? Let them hear the psalm that says, "By the word of the Lord the heavens were established; and all the power of them by the spirit of his mouth." The term "Word" will not be considered as this common form of diction that consists of names and expressions; nor will the Spirit be considered as vapor poured out in the air but as the Word, which was in the beginning with God, and as the Holy Spirit, which has obtained appellation as its own. As, then, the Creator, the Word, firmly established the heavens, so the Spirit, which is from God, which proceeds from the Father, that is, which is from his mouth (that you may not judge that it is some external object or some creature but may glorify it as having its substance from God) brings with it all the powers in him.… Since, then, the Savior is the Word of the Lord and the Holy Spirit is the Spirit from his mouth, both joined with him in the creation of the heavens and the powers in them, and for this reason the statement was made: "By the word of the Lord the heavens were established; and all the power of them by the spirit of his mouth." For nothing is made holy except by the presence of the Spirit.