From Baal HaSulam’s Pri Hacham, Igrot (Letters), Letter No. 26, pg. 85: “The golden bell and the pomegranate are at the hem of the mantle, and a sound is heard when the High Priest enters the sanctuary.”The word “Ephod” (garment of the High Priest) originates from the words “Where is the door?” since where there is a door, there is an entrance, even if it is locked. In the material world, we can see a closed door, a closed entrance, but in spirituality, only an open entrance is visible. One can see it only through complete faith; only under this condition does the door become visible, and at the same moment it turns into an entrance.
The moment that a person attains perfect faith, complete measure of bestowal, the entrance and the door are revealed to him as one. A second before this, he didn’t see anything, neither the door nor the entrance. And all of a sudden the door opens up. Did the door previously exist or not? No, it did not; the property that a person acquired turned into an entrance and a door, thus allowing him to enter.
In our world doors exist before we are ready to walk through them, but in spirituality, we first have to build our Kelim (spiritual vessels) in order to sense a new reality through them. Before we do so, spirituality does not exist. We have to give it its form. This is why both the door and the entrance are built by a person who attains perfect faith: bestowal.
During his upbringing, a person sways from side to side, like those looking for a door. At the final moments of his advancement, he is next to the entrance, but it is then in particular that he suddenly gets tired and takes a step back. He has no strength left to open the door, and spends his life wandering from place to place, searching for an exit but never reaching it.
Our path consists of multiple steps forward and back, and that continues until a real need to enter spirituality is formed within us. We have to prepare our desires because spirituality has no form of its own until we give it one. A person lacks the right perception, reaction, and clarification until he goes through all four levels of each desire. Gradually, he accumulates all the discernments and combines them into one structure which he reveals in the Light. One can only hasten the time of his development; he still must go through all the states.
From the Daily Kabbalah Lesson 7/9/10, Pri Hacham, Igrot (Letters), Letter 26, pg. 85