You can find many allegorical examples that illustrate the process of the spiritual closeness. For example, a clock with a pendulum that moves from side to side reflects that a person does half the work and the Creator does the other half.
A person is only required to prepare a deficiency—this is his free will—to prepare a deficiency with the help of the environment. The Creator is revealed according to the environment since the Light is constant and doesn’t change. If a person prepares a deficiency in the size of the first ten Sefirot in which he can reveal the upper Light in the new level, the Light is revealed.
So a person is always preparing a new deficiency and then the new level of the upper Light is revealed.
We should remember that the Light is in a state of absolute rest; it is eternal and unchanging. The Creator on His part always maintains the covenant with a person and doesn’t change its terms. A person must constantly renew the covenant.
Each time he shifts with his pendulum and makes a step forward and by that is rewarded with the revelation of the Creator, closer proximity to Him. By every such attempt, he should come out with the right impression so that all his work, on the level he now finds himself, between two ascents or two descents, will be for the benefit of the King. This means that his work should be in one direction “above reason” with one intention of valuing the attribute of bestowal above the attribute of receiving. Thus a person gets closer to the Creator.
Regarding this it says: “on all your sacrifices you shall sacrifice salt.” A sacrifice symbolizes closeness to the King, and by constantly keeping the covenant between you and renewing it, you are rewarded with a revelation.
From the 1st part of the Daily Kabbalah Lesson 6/17/12, Shamati #76