Nefesh HaChayim, Reb Itzele's Long Annotation

And everything is drawn from the name YHV”H (blessed be He)—as explained at length in the Etz Chayyim—it being that all four of the primeval roots are one single YHV”H, for it was God-YHV”H’s (blessed be His name) Will to create the entire world in the form of a YHV”H in this way, so that in all parts of existence would be found the powers of the four roots.