Baal HaSulam, “600,000 Souls”: And when a single soul is purified from all its filth, it will draw onto itself the whole of the soul of Atzilut, and through it, all the souls of its generation will be completed. This is the meaning of one being dependent on the other.
This is the result of complete mutual connection of all souls. Hence, no soul can ascend without taking all souls along with it; its ascent depends on them. It is an integral system where all parts are mutually linked. By correcting itself, every soul corrects its connection with the other souls, thereby bringing them closer to correction as well.
To correct oneself amounts to mending one’s connection with the others. Their individual state remains unchanged; I am only preparing them for corrections that they will later undergo. In fact, I precede them as a previous generation. I establish a connection with them without their awareness or understanding of what I am doing.
I employ the entire system of souls so as to correct the connections within it to the best of my ability. However, the souls who are not yet ready for it cannot understand and feel my actions. They haven’t arrived at correction yet, but I use them in it, and that is called the preparation of sons by the fathers. It is similar to how in our world where we improve the world for the future generation, and our children who come after take advantage of everything that we have prepared for them.
We correct the connection between us, our “layer,” until the differences between the souls get erased, and from our side, the entire humanity is corrected. But they themselves don’t feel it. When their time of correction arrives, they will receive all the necessary tools for it.
Why are they entitled to this? I, too, received assistance from the previous generations, from the "older" souls, some time ago. Each new generation is born with even greater egoism, and without such preparation, they cannot accomplish the work. We are all doing relatively the same work: Those who must correct greater egoism receive greater assistance.
From the 4th part of the Daily Kabbalah Lesson 9/26/10, "600,000 Souls"