Generally, there are three things in the world: 1) the Creator, 2) the created beings, 3) the delight and pleasure that the Creator gives to the created beings.
In that sense, we discern the world of Ein Sof [infinity] filling all of reality. There is no beginning or end there. Here, there is no room for work because there is nothing to add.
The first receiver, called Malchut, wanted equivalence of form. She said she did not want to receive in a manner where she is the recipient. Thus, the first Tzimtzum [restriction] took place, and the many worlds and Partzufim [pl. of Partzuf] and souls and angels were made over Behina Dalet [4th Phase/Discernment].
In other words, Behina Dalet became the root of all the corruptions and the place of corrections, which did not exist before Behina Dalet emerged, when Malchut, who is called “receiver,” did not want to receive in her own quality.
Since the new vessels of reception, called in order to bestow, are attributed to the created being, this unfolds slowly because we are going against nature, meaning against the will to receive that emanated from the Creator, for the lower one to receive. For this reason, the desire that comes from the Creator, everyone wants to work with this desire.
That is, with the desire to bestow, all of our work is that we must go against the nature that the Creator created. The end of correction is when the general will to receive will be corrected to work in order to bestow. At that time, there will be no work.
It follows that there are only four Behinot [discernments]: 1) Creator, 2) created beings, 3) the gift that the Creator gives to the created beings, 4) the created beings wanting to give to the Creator.
Thus, the labor is because we must work against nature. Conversely, in the will to receive that comes from nature, from His desire to do good to His creations, there is nothing to work on. Instead, work is only on the desire to bestow.