Musar su Esodo 8:15

When we follow the approach taken by the Zohar we realise that G–d never interfered with Pharaoh's decision-making process at all. Pharaoh duped himself. The cause of his obstinacy was אני, G–d saying: אני י-ה-ו-ה. When G–d said to Moses early on in Exodus 7,3: ואני אקשה את לב פרעה, I shall make the heart of Pharaoh obstinate, the implied meaning is: "My revelation to him that I am י-ה-ו-ה, will harden his heart." When the magicians acknowledged that the plague of כנים, lice, was not the result of superior magic by Moses or Aaron (8,15), they limited their acknowledgement of its origin to אלקים, thereby excluding י-ה-ו-ה. Pharaoh had learned the meaning of אלוקים from Joseph; he acknowledged this deity as superior to other deities. His acknowledgement did not extend to such a deity's control of what he considered the laws of nature. We have a rule in Berachot 48 אין מלכות נוגעת בחברתה, "since G–d has assigned sovereignty to a certain king, or kingdom, another king or kingdom must not infringe on the sovereignty of such." [The Talmud illustrates this principle by pointing out Saul's artificially delayed arrival in order that the commencement of his kingdom should not shorten by as much as a minute the period G–d had designated for the leadership of the prophet Samuel. Ed.] Pharaoh understood that the existence of the kingdom of אלקים, though presumably greater than that of his own or other kings, would not interfere with the sovereignty of other kingdoms. There are many kingdoms in this world which co-exist although some are more powerful than others. It is also possible that Pharaoh acknowledged G–d as the Master of the Universe, but did not consider the Universe as G–d's creation, but rather considered Him part of the Universe. Other philosophers conceive of G–d as inseparable from the world, much as they view light as inseparable from the sun. For all these reasons, i.e. limiting G–d's possible domain, Pharaoh was angered when Moses pointed out that there was an added dimension to G–d. Pharaoh reacted by increasing the workload of his Jewish slaves, as we read in Exodus 5,9.