And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
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Ephrem The Syrian
AD 373
It was appropriate to reveal here that the Spirit hovered in order for us to learn that the work of creation was held in common by the Spirit with the Father and the Son. The Father spoke. The Son created. And so it was also right that the Spirit offer its work, clearly shown through its hovering, in order to demonstrate its unity with the other persons. Thus we learn that all was brought to perfection and accomplished by the Trinity.