Musar su Ecclesiaste 8:9

This brings us to the mystical dimension of Exodus 10,1: למען שיתי אתתי אלה בקרבו, "In order that I can place these My signs in its midst." G–d performed all these miracles in His capacity as י-ה-ו-ה, as I have pointed out in my commentary on the last two portions, in connection with G–d proclaiming: אני י-ה-ו-ה. The Zohar, commenting on Kohelet 8,9: עת אשר שלט האדם באדם לרע לו, "There is a time when one man rules over the other to his detriment," explains that just as the oppressors of the Jewish people became the ראש because they temporarily enjoyed the fact that the שכינה had chosen them to be its "mantle", so the same שכינה, when the time is ripe, will exploit this fact to humiliate these oppressors. This is the mystical dimension of the words אשר שלט האדם, the ideal prototype of man as found under G–d's "throne," in the verse just mentioned. The second word באדם in the same verse refers to אדם הבליעל, depraved man. The letters in G–d's name "expand" to engulf and humiliate the respective שר who functioned as a temporary בכור, first-born. The plagues on the nation of Egypt were orchestrated with the help of the מטה, staff. The letter י of the name of G–d on that staff expanded into Ten Plagues, whereas the letter ה engraved on that staff ensured that each plague would appear in five guises as mentioned by Rabbi Akiva in the Haggadah shel Pessach.