Kundalini

It is a specific characteristic of Kundalini that it gives the individual an amazing amount of energy, without giving any understanding or wisdom. In the right context, it can lead to wisdom, but on its own does not impart understanding. It does not resolve the individual's personal issues and conflicts. Its manifestation can lead to ego-death and cosmic consciousness, and then the Essence can descend. But if we were to depend on Kundalini, the human dilemma would stay the same, and this does not offer much hope for many people. (The Elixir of Enlightenment, pg 40)

We have just said that Kundalini is an aspect of Essence. This is true, but in a very specific way -- in the sense that Kundalini is a true energy, the energy of Essence. However, Kundalini is usually not seen as an aspect of Essence because it is energy. Essence, in the strict sense of the word, is our being. It is the very substance of existence. The essential aspects exist on the being level and not on the energy level. (The Elixir of Enlightenment, pg 40)

Space and kundalini

It should be noted here that the experience of the column of space and of the mind as boundless space is usually the crown of the process of development of what some systems call the Kundalini. In this process, energy ascends up the spine into the head, causing all kinds of unusual experiences. However, when the process is successful, it culminates in the experience of boundless space. This experience is sometimes called the void, or "akash", a Sanskrit term. We'll see later that this realization is not really the apex of human development. The void is the emptiness which in time will allow the unfolding of the fullness and richness of Being. Just as the void is the combination of the process of the ascent of energy, it will become the beginning point of a process of the descent that will bring the fullness of Being. (The Void, pg 58)

Shakti & Kundalini

...kundalini for their practices try to cultivate and direct. Kundalini is the name given to a reservoir of dormant energy, visualized as a serpent coiled in the first chakra at the perineum. By awakening the kundalini, the shakti is activated, which then rises up the spine activating and energizing the chakra centers. The chakra centers become doorways to deeper spiritual experiences and dimensions. (The Inner Journey Home)