Baal HaSulam, “Introduction to the Study of the Ten Sefirot,” Item 54: When the Creator sees that one has completed one’s measure of exertion and finished everything he had to do in strengthening his choice in faith in the Creator, the Creator helps him. Then, one attains open Providence, meaning the revelation of the face.
This is where the work in the group comes in—all of the person’s obligations, according to the designation of his soul and his generation, which can be very different from one generation to another and from one person to another. No one knows for sure what one’s obligatory measure of exertion is, since it is very personal, because everyone stems from the spiritual root of his soul. Even when we correct ourselves and connect, we are still in different states, although we are connected into one big vessel.
Every time new people join us, we immediately connect to them in one system, and accordingly changes take place in us. There is never a change in a person that stems from himself. If he lived alone in the world, he would never change.
All our changes are a result of perpetual movements towards connection in the general vessel. This influences everyone personally, each time awakening a new environment, in the attitude towards a person, to which he has to connect: either by the path of sufferings or by the path of the Torah. This is how everyone operates throughout his life.
Most people go through these connections unconsciously, unprepared, not understanding what they are doing and what they are living for. This is how they are reborn from one generation to another and their whole correction is done unconsciously. About this it says “go and make a living from one another.” Everyone influences everyone else and as a result everyone changes according to the Reshimot (informational records) in the general shattered desire.
So no one changes on his own. All the changes stem from the fact that a person forms different connections with others at any given moment. This is how this general system exists and operates.
It either happens on an unconscious level, or in people who are already on the preparation level, which means that they want to advance to conscious actions. In the meantime, however, they only make efforts, as preparation. They work on it so that they will be worthy of their advancement and to participate in it actively, and thus they advance.
From the 1st part the Daily Kabbalah Lesson 12/3/12, “Introduction to the Study of the Ten Sefirot”