In our world, we do not understand either of them because we do not have the real quality of bestowal and love, and we act only out of egoism. Yet, it is impossible to understand one without the other.
We have absolutely no contact with the upper world, nothing but a spiritual spark. Therefore, everything depends on our contribution to the development of integral relations in the group. Through such relations, we can attract the upper Light, and it will create the system of interrelationships in us where we will exist in both good (light) and bad (dark) states.
Question: When will we begin to understand what light is?
Answer: It will happen when we begin to realize that we are in darkness.
Question: It is written that the Creator created us as opposite to Him. Is it not so?
Answer: It is about the real egoism that we still need to reach. We, however, are at inanimate, vegetative, and animate levels. Now, we must rise to the fourth, human level. It is this level that is opposite to the Creator. We have yet to reach this level. We reach it in the spiritual world as the left line.
From the Kabbalah Lesson in Russian 12/10/17