For centuries, the profound writings of the holy ARI stood as a towering summit—glimpsed by few, truly scaled by none. Then came Rav Yehuda Leib HaLevi Ashlag, also known as Baal HaSulam, the greatest Kabbalist of the twentieth century, whose monumental commentary shattered the silence. In this first volume of his six-part masterwork, The Study of the Ten Sefirot, he lays the foundational architecture of the spiritual worlds: precise, luminous, and accessible as never before. No Kabbalist before him dared, or was able to open these gates so completely. For the sincere seeker, this is not merely a book; it is a map of creation itself, drawn by a hand uniquely qualified to reveal what had long remained hidden.