An excerpt from A Treatise against Noetus, Book 1
God was all alone and nothing existed but himself when he determined to create the world. He thought of it, willed it, spoke the word and so made it. It came into being instantaneously, exactly as he had willed. It is enough then for us to be aware of a single fact: nothing is coeternal with God. Apart from God there was simply nothing else. Yet although he was alone, he was manifold because he lacked neither reason, wisdom, power, nor counsel. All things were in him and he himself was all. At a moment of his own choosing and in a manner determined by himself, God manifested his Word, and through him he made the whole universe.
When the Word was hidden within God himself he was invisible to the created world, but God made him visible. First God gave utterance to his voice, engendering light from light, and then he sent his own mind into the world as its Lord. Visible before to God alone and not to the world, God made him visible so that the world could be saved by seeing him. This mind that entered our world was made known as the Son of God. All things came into being through him; but he alone is begotten by the Father.
The Son gave us the law and the prophets, and he filled the prophets with the Holy Spirit to compel them to speak out. Inspired by the Father’s power, they were to proclaim the Father’s purpose and his will.
So the Word was made manifest, as Saint John declares when, summing up all the sayings of the prophets, he announces that this is the Word through whom the whole universe was made. He says: In the beginning was the Word, and the Word was with God, and the Word was God. Through him all things came into being; not one thing was created without him. And further on he adds: The world was made through him, and yet the world did not know him. He entered his own creation, and his own did not receive him.
and to the Son
and to the Holy Spirit:
as it was in the beginning,
is now, and will be forever. Amen