The Midrash, “BeShalach”: The Pharaoh entrusted none of his servants to harness his chariot. He did it himself and exclaimed: “This is a battle against the King of Kings. So, I should be the one who harnesses the chariot.”
The Pharaoh wants all of Divinity to be filled for the sake of egoism. He doesn’t want Malchut to rise to Bina; rather, he wants Bina to descend to Malchut. He wishes the entire system to work not for the sake of Infinity (Ein Sof), not for the sake of bestowing to the Creator, but for his own sake.
By desiring to attract the entire Upper Light for the sake of his own self and using it for his egoistic needs, he “harnesses the chariot,” meaning, he gets ready to receive the Upper Light.
From KabTV’s “Secrets of the Eternal Book” 4/23/14