Answer: Your whole desire to receive is divided into 125 degrees of thickness: how cruel and tough you can be on the zero level that is hardly revealed, like a mosquito, up to a wild beast on the level of minus Ein Sof (Infinity).
These are the 125 degrees that we count from our state up to the world of Ein Sof. 5 worlds times 5 Partzufim times 5 Sefirot, this is how the Ha-Va-Ya-H is divided.
We have to correct this whole desire to receive. It wakes up at another part of the 125 degrees each time by being added to you, and you have to correct it. Therefore, you constantly feel a growing darkness and you correct it, and from this darkness you attain the “dressing of Hassadim” where you discover the Light. The darkness is the same Light but without the dressing of Hassadim.
First, in the world of Ein Sof the Light doesn’t need the dressing of Hassadim. But later after Malchut of Ein Sof decides that it receives only in order to bestow, the Light disappears and illuminates, which means that it is awakened in the vessel, (since it actually doesn’t disappear at all, but we only say that it does), only in the dressing of Hassadim. To the extent of the dressing, you receive the Light. It is as if you have a certain lamp and according to its strength you discover the power of the Light that you receive.
From the 2nd part of the Daily Kabbalah Lesson 5/16/12, The Book of Zohar