Answer: “Round” vessels are the storage, archive of all desires, which we need to extract from there and correct. They are desires of the World of Infinity, still before the restriction. Through them the Upper Light can influence those who still don’t have a screen.
Souls that have a screen work with “straight” vessels (Kelim de Yosher). They are situated in “straight” unification with the Upper Light. However, if I don’t have a screen, I cannot influence the Creator.
And how can the Creator influence me? He influences me through “round” vessels since He exists everywhere, in all desires. Through them He can influence me since I, too, have “round” vessels which I still haven’t “straightened out,” directed them to the Creator.
Therefore, there are two types of Upper Governance: individual and general. I exist under the individual, private Governance if I am able to be connected to the Creator in mutual bestowal. In that case, He gives to me, I give to Him, and we work together completely “straight”: “the measure of suffering (effort) determines the measure of reward,” meaning the screen determines the whole profit, and this is how I advance.
Meanwhile, the “round” desires indicate that I am unable to overcome anything. I don’t even know or understand that I am receiving since the whole world does it. Until a person acquires a screen and starts working “in the line,” he is controlled through the “round” desires, meaning he receives without thinking, like everyone else.
The Light reaches us through the “round” Kelim and rouses a “straight” reaction in us because we have no other opportunity to respond to the Creator. If we react properly and in a “straight” manner to the way He influences us through the “circles,” we enter into contact with Him. We reveal the Creator as a Giver and receive the whole fulfillment in a “straight” manner, with the help of the screen.
And if not, then we are sent various disasters and misfortunes through the “round” desires. The “circles” control and turn us in all directions, but if we establish a “straight” connection, we take the control into our own hands.
From the 3rd part of the Daily Kabbalah Lesson 12/3/10, Explanation of the Article, “Preface to the Wisdom of Kabbalah”