The emanated being {i.e. the creature} consists solely of the will to receive. Because of its will, it abandoned the boundaries of the Emanator {i.e. the Creator} and came into existence as a separate being. It was identified as a severed being through the will to receive, since there is no trace of such a will in the Emanator. How could a will to receive function in the Emanator, for from whom could He receive?
(p. 61)
Hence it is not enough to possess the will to receive (which resides in the Light and is caused by the Creator Himself) but the emanated being must, by its own active efforts, reveal in itself the will to receive. It must draw abundance by its own arousal of will and endeavor to a greater degree than in the originally extended Light bestowed by the Emanator Himself. Only after this utmost exertion of effort is it possible for the vessel to permanently envelop the Light.
... If it were not for that individual exertion of will to draw Light, the Light would never... acquire its individual name: the "Endless Light".
(p. 93)
Editor's note: A vessel cannot fully realize its capacity to receive Light until it's sole motivation for receiving is to give pleasure to the One who gives (God). This transformation is described in more detail elsewhere.