The Writings of Rabash, Volume II, Letter 40: And when one begins to feel the love of his friend, joy and pleasure immediately begin to awaken in him, for the rule is that a novelty entertains. His friend’s love for him is a new thing for him because he always knew that he was the only one who cared for his own wellbeing. But the minute he discovers that his friend cares for him, it evokes within him immeasurable joy, and he can no longer care for himself, since man can toil only where he feels pleasure. And since he is beginning to feel pleasure in caring for his friend, he naturally cannot think of himself.
We see that in nature, there is love until the yearning becomes unbearable…
There are Reshimot (reminiscences) in us, memories from the general vessel of the soul. All the reality that we feel and even the parts that we don’t feel are in us and are part of the vessel, just as it was before the shattering of the vessels. So the moment a person feels the love someone feels towards him, not the egoistic love we know in our world, but a love that comes from the height of the corrected general soul, from the corrected source, the Reshimo of the general vessel, which is perceived as external at the moment, is immediately evoked in him.
Thus a person immediately feels that this force comes from another world, from an upper state, and his self-love is annulled. He cannot remain in the state of self-love and is ready to give his soul to the new inclination, to the connection that is external to him. It takes place this way, because it is the external vessel that is the real, general, upper vessel compared to the individual egoistic self-love that dominates him now.
A person annuls himself before this power. If a person feels that he is loved and that the inclination to spiritually love someone who is external to him is suddenly evoked, then the corporeal animal self-love disappears. It is because a person feels that the large, general vessel is much higher than the small individual vessel, and so he annuls himself before this love.
From the Preparation to the Daily Kabbalah Lesson 10/2/12