קו is a ray of Divine "light" from אין סוף that pierces the צמצום (constriction) and contains the ingredients for the worlds below. It is the reintroduction of Divine light into the חלל (void) to allow existence to come into being.
Definition
The קו (Kav, lit. "line" or "ray") is the channel through which Divine vitality is drawn down into creation. After the initial צמצום, which created a "void" seemingly empty of G-d's infinite light, the קו is drawn from the רשימו (impression) that remained.[1] This line pierces the darkness of the void, carrying the potential for all subsequent creation.
While the קו is described as defined and finite, enabling it to give rise to finite worlds, it also possesses an undefined and unlimited quality, as its root comes from the original, limitless light that preceded the צמצום.[2] The light within the קו is revealed only according to the capacity of the recipients.[3]
Paradoxical Nature
The קו embodies two seemingly contradictory but interdependent aspects:[4]
- The Measuring Line (קו המידה): The קו is also called the "Builder's Rod." It measures and allots a specific, finite measure of Divine vitality to every entity, including the קליפות. It gives measure to all lights and vessels.
- Unifying Power: Because its source is the essential, limitless light, the קו has the power to unify opposites, such as "including the left in the right." It is through the קו that a light can be exchanged into a vessel that is not its own.
These two functions are interdependent: the very power that allows the קו to unify all opposites is what enables it to also measure and define every detail of creation.
Concealment
In our world, which is experienced as an absolute and independent existence, the קו must be in a state of absolute העלם (concealment). The more revealed the light of the קו is, the less the world is felt as a separate existence.
Teachings of the Rebbeim
The ultimate purpose of creation is fulfilled through the work of the "simple servant" (eved poshut). This individual, immersed in the material world without a natural sense of the Divine, exerts himself against his nature to serve G-d. This self-generated effort, in its innovative nature, generates a completely new, unprecedented Divine energy which is higher than the source of the קו itself.[5]
References