When rising to Bina, a person (Malchut) annuls himself above all the egoism that is revealed in him. Ibur (gestation) is a terrible state for the desire to receive. Imagine that you returned to the womb: There can’t a more terrible state for you; you have no air, no light, and no freedom to move. You are squeezed into a narrow confinement, like in a vise gripping all your senses, so that you can’t move internally in your consciousness or externally.
Entering the spiritual womb is a terrible feeling, spiritual claustrophobia…but you prefer this state, because if you are in it, in Bina, in the attribute of bestowal, then you don’t need anything! You accept the dark solitary confinement as the good promised land, as heaven. The condition for entering spiritual Ibur is to change your appreciation of Malchut to Bina and to begin to value the attribute of bestowal.
From the 3rd part of the Daily Kabbalah Lesson 3/11/13, The Study of the Ten Sefirot