Know that because the Sefirot are Divine, there is no difference between the peak of [the highest Sefira of] Keter in the [highest] world of Adam Kadmon and the Sefira of Malkhut [the lowest Sefira] in the world of Asiya [the lowest world]. Nevertheless, there is a vast difference from the perspective of the recipients. For the Sefirot are perceived as both lights and vessels. The lights in the Sefirot are entirely Divine, as discussed.
But the vessels, which are the KaḤaV TuM in the three lower worlds (Beria, Yetzira, Asiya), are not an aspect of the Divine, but an aspect of a cover which shields the light of Ein Sof that is in them [KaḤAv TuM]. They [the vessels] measure and allot the proper amount of enlightenment for the recipients. Each recipient receives only the measure appropriate for the person’s level of purity.