Ramchal presents three major points in his comments to Petach 31 which we’ll paraphrase here (as they’re put rather obscurely in the original).
The first: the fact that there are multitudinous worlds in the trace environment alludes to the very many traits and related appellations that God exhibits in the universe; but the fact that the Tetragrammaton itself sits at the very core of Adam Kadmon which is itself the heart of the entire created universe and is in intimate contact with the line itself, alludes to the fact that God’s actual Being — not just His attributes — constitutes the very core of existence. And it’s the later, like the line itself, which governs the universe at bottom.
(c) 2011 Rabbi Yaakov Feldman
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Rabbi Yaakov Feldman has also translated and commented upon “The Path of the Just” and “The Duties of the Heart” (Jason Aronson Publishers).