The chakras work with the energy that is the raw material for emotional states… Prana is the energy connected with breathing and hence with vitality… Kundalini is the main energy that fuels the chakra system. It is connected with sexual energy, but it is sexual energy only when operating in the lower chakras. In the heart chakra it is experienced as love; in the head chakras it is experienced as light. Shakti is the same energy but in a different form, that of power. It is experienced as having more of an electrical quality than kundalini. – A. H. Almaas, Essence with the Elixir of Enlightenment: The Diamond Approach to Inner Realization