Baal HaSulam writes in the article “The Arvut (Mutual Guarantee)” that all those who aspire to the Creator are one nation where everyone is responsible for one another. This is called mutual guarantee. The Torah (the Light of Correction) was given to this nation only after every person was asked: Do you agree to carry out the commandment of love for the neighbor? “Love your neighbor as yourself” means to take care of others no less than our nature forces us to take care of ourselves. This is the condition that enables us to draw the Light of Correction upon us. The Light will come and correct our spiritual vessel only if we reveal that we want to unite in this way.
Mutual guarantee is when, having ascended above our own desire, we already comprise one unified body, one organism, and we all depend on each other. To do this, every person must have an anti-egoistic screen and be in the spiritual world on the level of bestowal (Hafetz Hesed), while also treating his material life as a necessary component for his spiritual life.
Operating in mutual guarantee, every person fulfills another and understands that he has to be connected with the others. His entire life takes place for the sake of this, like it happens with the cells within one’s body. Every cell and organ of the body lives in order to carry out its function in relation to the common organism. The meaning of its life is love and bestowal. When we perceive this connection among us, this is called spiritual life.
If we desire to unite in this way, then we will receive the force to carry this out!
From the 3rd part of the Daily Kabbalah Lesson 5/18/10, Article “Arvut (Mutual Guarantee)”