The term Kundalini originally belongs to the Tantric tradition. This life energy (Prana) divides into two realities, namely Shiva (the consciousness in total rest) and Shakti (energy in motion). Shakti, the holy fire, is also called the snake. Shakti is the causative agent of the illusion and conditioned ego thinking and leads to all karmic formations, but she is also the liberator of this. When the Kundalini becomes active (when the snake awakens) you enter a transformation process. The energy system cleans itself from old karma and forms a new light body. In other words, you are leaping to a higher level of consciousness. This process is actually about embracing your shadow side so accepting contradictions in yourself. It is important that you allow your emotions. These emotions are still related to the past. After processing this comes the inner peace.
