Our inner work is revealed to us piecemeal, in parts that pertain to its execution. We aren’t given the ability to see the entire sum total of all the work we have accomplished, lest it pose an obstacle for us.
A person is constantly consumed by the desire that is revealed in him at the present moment. He forgets about everything he did in the past and constantly feels empty. The more he works, the more the things he has already done become concealed from him.
Even though he has performed many corrections and nothing disappears, he is given the feeling that he has not done anything. This happens so he always has the opportunity to do more, so a new desire can be revealed just like the first time. This continues until he carries out a certain volume of work. Then, in one final action called "Rav Paalim UMekabtziel" he will reveal the entire correction that he has accumulated.
However, along the path we are obligated to forget about all the states we have gone through in order to receive a desire for the next action. Otherwise we would stop and be unable to keep advancing. As long as a person hasn’t completed all the corrections, his entire previous work is concealed from him, as if he has not done anything. Yet, everything will become revealed at once, at the End of Correction!
Everything repeats over and over again, but since a new desire constantly comes to us, it seems like it’s a completely new state. "It is as if we begin everything anew every day." We reveal a new appetite and new tastes in the material world just like in the spiritual world.
Therefore, even if it seems like we have not done anything in spirituality and that we did not attain anything, we will reveal later that this is not so. But until the very End of Correction, we cannot ask or demand for anything that we deserve for the past. On the contrary, we have to be grateful for the fact that the past is concealed from us because this way it does not blind us and prevent us from moving forward. It allows us to begin all the work anew every time.
From the 3rd part of the Daily Kabbalah Lesson 7/6/10, Talmud Eser Sefirot