Kali is the primary Goddess of Yoga, the background Yoga Shakti, the power of Yoga or Kriya Shakti. She is the power that takes our energy within, which causes us to seek the eternal and lose interest in the ordinary outer affairs of life. She is the electrical stirring of the soul to Divinity. She is the voice of God reverberating within us and the will of God as it works through us, when we let our little self or ego fade into the background. Kali is the power of the great current of awareness. She is also the power that allows the mind to concentrate.
Kali is the great Prana or cosmic life-force, she represents the most primal will of all life, which is to live forever and to never die. This core wish for immortality is not some mere delusion or arrogance within us, it is the very reflection of Sat or pure Being into creation, the portion of the Eternal that is our soul.
Kali represents the most primal desire, which is to love all and be one with all, to find the perfect, pure and eternal love, which is the presence of Shiva, the Eternal Being and Consciousness hidden in all life. Hidden even in ordinary desires is her ascending force to get us to seek something more beautiful and wondrous, to take us beyond our boundaries, to make us unhappy with what we already have, in order to reach a greater reality beyond.