Part 1: The Sefirot are lights. It is through the Sefirot that Godliness “unfolds” or “extends”. We cannot refer to the unfolding or extension (התפשטות, hitpashtut) of Godliness as anything but a radiation of light (הארה, he’arah). For the truth is that Godliness does not “extend”, since the concepts of “extension” and “change” are not applicable to God. However, we call the radiance that spreads from Him the “unfolding” or revelation of Godliness, and accordingly we say that the Sefirot are radiations of light.