Answer: The spiritual world is revealed when a person can build himself to be in a correct mutual connection between good and evil, not killing evil and not adhering to the good, but creating a connection in which the two forces complement each other. There is no evil without good and there is no good without evil; there is no Light without darkness and there is no darkness without Light. The central line must stabilize them correctly.
If a person acts correctly through directing himself between these two lines, his egoism will constantly grow. That is how he can produce a positive force, placing himself opposite the egoism and building himself in the middle line. This sums up the entire method of the wisdom of Kabbalah, and this is education of the self.
The moment a person begins to do this correctly between them, he begins to feel the upper world in the middle line. This is the state of nature, which consists of a precise balance between the positive force and the negative force.
On the levels of the still, vegetative, and animate, these forces cooperate mutually in a natural way, instinctively, so that they don’t require any work. But on the human level we must find that good force in nature to balance the negative force through it and develop this way. Humans, being the worst of all in our world, can also ascend higher than all.
The two forces are seemingly found outside of humans. But when we begin to examine them, we clarify the negative force within us and feel what kind of positive force we need through which to balance the negative force. All of this is possible only if we correctly cooperate mutually in a group, a group of ten.
From the Kabbalah Lesson in Russian 7/3/16