The Book of Zohar, “VaYikra,” Item 411: The root of all the sins is the increase of the left over the right. Every person has a root Above, and a person who sins increases the left and separates it from the right and creates a dispute between the right and the left, just like the dispute between them before the middle line included them.
All our actions in this world are characterized by nothing but the intentions. If, for example, I kill a man, it all depends on whom I kill. If I kill an animal, the main point is why I do it: perhaps I kill only for the fun of it and perhaps I want to give someone a present.
This means that all our actions are characterized by the intentions, because the same action can lead to a terrible outcome and it can lead to a good outcome, but our intentions are concealed. So the wisdom of Kabbalah is called the concealed wisdom. It teaches us how to control our secret and true concealed intentions which are behind our decisions and our ideas.
When we begin to search ourselves seriously, we come to the conclusion that we are total egoists who seem to act for our own good, but who actually only cause ourselves harm. How can we change ourselves so that we will really do ourselves good? This is a problem.
All our work is internal and so it’s called the concealed study. Another’s eye doesn’t see how a person works on himself, who he is and what he is, since the great changes are internal and not external.
When a person begins his spiritual work, he withdraws into himself and becomes simpler, but at the same time, he seems a bit strange to others because totally different values that are not accepted in society gradually develop in him, which may appear strange to those around him. But on the whole these are trivial phenomena.
From KabTV’s “Secrets of the Eternal Book” 10/24/13