There is no “upper world”; the upper world is the connection between us. If we feel this unification, we will sense the upper world within it. It does not exist somewhere outside of us. The spiritual world does not exist on its own. We, ourselves, create it and form it.
There is the simple upper Light, and there is a point standing in the midst of the Light. It is divided into many parts. If we unite this point into one whole and connect all of its parts together, it becomes similar to the Light. According to the law of similarity of form, it turns into a big vessel (Kli) for the Light.
It turns out that this black point within the Light of Infinity is transformed into a huge vessel that includes the entire Light. Without connecting its parts together, there is no vessel, there is nothing except for the black point. “Existence from existence” is the Light, while “existence from absence” is a tiny desire, which is still not sensed, non-existent as the creature.
From Lesson 1, Arvut Convention at the Arava Desert 11/18/2011