On the second day the firmament was made and was called heaven, and it was placed so that it made a division between waters and waters, and the waters which first were waters were made waters, the waters which are under heaven and the waters which are above heaven. And heaven was made heaven and heaven; heaven above heaven and heaven under heaven. Even to this day also heaven is above heaven, and heaven under heaven, and the whole is from one heaven and is one heaven. But before this heaven, which is called the firmament, was made from that heaven, that heaven was not heaven and heaven, but only heaven. Nor were those waters waters and waters, but only waters. Both the waters and heaven were one heaven; and that heaven and those waters were neither above heaven nor under heaven, but above earth; and there was nothing between heaven and earth because there was nothing except heaven and earth. And yet there were waters, and there was darkness, and there was the abyss: the abyss in the earth, the darkness and the waters in heaven.
Hugh of Saint Victor, De Sacramentis, I,1,6, trans. Roy J. Deferrari