Answer: A good indicator is one’s discovery of the deficiency from which the spiritual Kli (vessel) is constructed. As it is written, “God will complete for my sake.” This means that, in response to this deficiency, the attribute of bestowal will truly arrive. Through it, our spiritual Kli will be filled.
We were given the initial Kli, HaVaYaH, about which it is said, “I the Lord do not change (Ani HaVaYaH lo Shiniti),” “Yod-Hey-Vav-Hey,” or the four stages of the direct Light. We can broaden it only by attaining the root through the tip of the “Yod” through which all of the HaVaYaH is filled to the same extent to which we open to Her the place of fulfillment, our deficiency.
The fulfillment is measured by the extent of bestowal that is acquired by this HaVaYaH (Yesod of Neshama – foundation of the soul). The soul (Neshama) is filled with the letters: “Yod-Vav-Dalet” (the complete spelling of the letter “Yod”), “Vav-Yod-Vav” (the complete spelling of the letter “Vav”), “Hey-Yod” (the spelling of the letter ”Hey”), and so on.
How can the Kli of HaVaYaH, the “skeleton” of the soul, be filled with letters? After all, the letters are also Kelim. Does that mean that I seemingly fill a pail with empty cups? Is that called filling? I wanted to be filled by the Light! The bestowal that the Kli acquires is specifically called the Light. It fills it, and it doesn’t need anything else.
Therefore, the acquiring of deficiency for the desire to bestow is the essential preparation of the person himself. When the desire to bestow arrives, it will fill the Kli with longing for bestowal, for love. There is no other filling: only this!
When a person is filled with the attribute of bestowal, he studies the Creator, the upper force, and becomes like Him. It is especially in this that he feels the fulfillment, that is to say, the filling is the Masach (screen) and the returning Light.
This is what we need to long for, to prepare for. All the work is just for this purpose. The main problem is not to become confused and not to replace the real fulfillment from bestowal, from the desire to bestow, the desire to love, with other fillings. No other fulfillment is able to give us more from this corporeal life than the very “small candle” and the awakening to spiritual life, meaning a kind of weak luminescence that stimulates the desire to receive and forces it to search for real fulfillment.
Therefore, all of our work is to search for the correct deficiency, and thanks to it, we become familiar with the Creator. That is what we can add to His work.
The Creator created the desire to receive, and we add to this desire our new correct form. We take this raw material and sculpt from it what seems to us as good and correct. Thus, we complete the creation.
From the 1st part of the Daily Kabbalah Lesson 1/30/12, Writings of Baal HaSulam