The text suggests that this one plague carries a message about the oneness of God that is so overt, so utterly convincing, that it can be seen as equivalent to all the other plagues combined. Finally, look at how this same verse characterizes the target of the plague, as it were. Even more than the land that the plague will strike, it is designed to strike upon a more personal battlefield: This time, I will send all My plagues into your heart (Exodus 9:14)
