Opacity (Kabbalah)

The maturity of the will to receive with a great yearning is called a great opacity (ovyut), whereas a slight yearning is called a slight opacity (ovyut). It is the expression of a vessel drawing the shefa in each partzuf, and is accordingly called the interiority of the vessel (Talmud Eser Sefirot, v. 2, Q & A 53).