The miracle of the rod’s becoming a serpent and the river’s being turned to blood did not move the hard heart of Pharaoh, only to increase his hatred of the Israelites. The work of the magicians led him to believe that these miracles were performed by magic, but he had abundant evidence that this was not the case when the plague of frogs was removed. God could have caused them to disappear and return to dust in a moment, but He did not do this, lest, after they should be removed, the king and the Egyptians should say that it was the result of magic, like the work of the magicians. They died, and then they gathered them together into heaps. Their bodies they could see before them, and they corrupted the atmosphere. Here the king and all Egypt had evidences which their vain philosophy could not dispose of, that this work was not magic but a judgment from the God of heaven.
(SR 116.1)
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The magicians could not produce the lice. The Lord would not suffer them to make it even appear to their own sight, or to that of the Egyptians, that they could produce the plague of the lice. He would remove all excuse of unbelief from Pharaoh. He compelled even the magicians themselves to say, “This is the finger of God.”Exodus 8:19.
(SR 116.2)
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Next came the plague of the swarms of flies. They were not such flies as harmlessly annoy us in some seasons of the year, but the flies brought upon Egypt were large and venomous. Their sting was very painful upon man and beast. God separated His people from the Egyptians and suffered no flies to appear throughout their coasts.
(SR 116.3)
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