The difference here is that in double concealment the person doesn’t know definitely, nor even approximately, what bestowal is, but only talks about it when he repeats what is written about it in the books. Thus, it is very difficult for him since all of these words are artificial.
We see this in his conversation, but he must do it like a child who, in the meantime, imitates the grown-ups and plays with dolls and cars. This is so, until he attains the state where the upper Light bestows on him, and it becomes enough to begin to feel the value of bestowal.
He begins to describe to himself, in his imagination, what bestowal is, how he exits himself toward others and loses himself there, how he begins to feel them and not himself. This is not even “we,” meaning, I am in connection with others. Instead, he ceases feeling himself and feels only what is external to him. It is not possible to convey this feeling with words, but it begins to be grasped within a person.
This is called reaching single concealment. Then, he begins to demand the disclosure of bestowal. It is now understood to him that it arrives only with the help of the reforming Light. In the transition from double concealment to single concealment, he sees that everything is realized only through the upper force and that only he, himself, can awaken this force through all kinds of actions, but not more than that.
Here, the demand matures in him that he must have the upper force that will produce within him the quality of bestowal. We are in this state now, before the congress in the desert, before the meeting with the Pharaoh and the exit from Egypt.
From the 4th part of the Daily Kabbalah Lesson 2/7/12, “Introduction to the Study of the Ten Sefirot”