It is through the names that the lights come to execute their functions, and their sum total constitutes the Torah. It is therefore called the craftsman’s tool of the Holy One, blessed be He.
Having discussed the letters, we now turn to the holy names, which are made up of various letter combinations.
The proposition has two parts: Part 1: It is through the names... This introduces the subject of the divine names of which the Torah consists. Part 2: It is therefore called… This explains the executive function of the names, which are the “craftsman’s tool” of the Holy One, blessed be He.