For the Spirit of the Lord filleth the world: and that which containeth all things hath knowledge of the voice.
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Ambrose of Milan
AD 397
As the Lord fills all things, so too we read of the Spirit, "For the Spirit of the Lord fills the whole world." You see also that it was said of all those who were gathered with the apostles, "They were filled with the Holy Spirit, and they spoke the word of God with boldness." You see that the Holy Spirit gives both fullness and boldness. It is his work that the archangel announces, saying to Mary, "The Holy Spirit shall come on you." - "On the Holy Spirit 1.7.87"
The words "the Spirit hovered over the waters" do not require us, as some claim, to understand that spirit by which this corporal mass of the universe is animated, allowing bodily creatures to generate and preserve themselves, each according to their species. In fact, such a being would also be a creature. Also, regarding the text, "The Spirit of the Lord fills the universe," there are those who understand by this that spirit which, as an invisible creature, encompasses and vivifies the entire visible creation with a universal breath. But even here I do not see what would prevent one from understanding the Holy Spirit, when God says in a prophet, "I fill the heavens and the earth." God in fact does not fill heaven and earth without his Holy Spirit. What is strange, then, if it was said of his Holy Spirit, "he filled the universe"? Indeed, he fills in one way when he sanctifies, as was said of Stephen, "He was filled with the Holy Spirit," and of many others. In another way he fills wit...
The true faith asserts that the Holy Spirit also is creator, not created. Indeed, how can one deny that he is creator, about whom it has been proven that he established the array of the heavens? David says, "By the word of the Lord the heavens were made, and by the Spirit of his mouth their entire array." And elsewhere, "Send forth your Spirit, and they shall be created." The one who made humanity is in fact the creator of all. Blessed Job calls him "the divine Spirit who made me." Therefore, just as the Holy Spirit created all things, in the same way he pervades all things, without limit. And one who pervades all things is true God by nature. It is written, "The Spirit of the Lord fills the world." And even blessed David attests that the Spirit is everywhere, saying precisely of God, "Where will I go, far from your Spirit, and where will I flee from your face?" Then how can the Arians deny that the Holy Spirit is God, given that we are the temple of the Holy Spirit, just as we are the...
We will show that the Scriptures say that the Son is almighty like the Father, so that not only reason, but the divine witness as well, would persuade the shameless minds of heretics. The Father is called almighty, because the prophet says, "Thus says the almighty God." The Son is called almighty when the apostle John says in Revelation, "From Jesus Christ our Lord, who is, who was and who is to come, the almighty." The Holy Spirit is also called almighty: "The Spirit of the Lord fills the universe, and he who embraces all things, knows." Is it possible that the one who encompasses everything not be almighty? - "Sermon on the Creed 4.8"
