Commentary on Exodus
Eusebius of Caesarea (260–339)
And when an angel appears to Moses, Holy Scripture also makes it plain, saying, "The angel of the Lord appeared to him in a flame of fire in a bush." But when it refers to the actual being who replies, it calls him God and Lord and no longer an angel. It is equally clear in its distinction between the angel and the Lord in the account of what happened at the Red Sea.
Everything that has ever existed or now exists derives its being from the One, the only existent and preexistent being, who also said, "I am the existent." … As the only being and the eternal being, he is himself the cause of existence to all those to whom he has imparted existence from himself by his will and his power and gives existence to all things and their powers and forms, richly and ungrudgingly from himself.
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