What does kundalini have to do with spiritual enlightenment?
First we need a few concepts: In yogic anatomy the sushumna is the central channel and conduit for the kundalini energy that runs along our spine and up to the crown of our head. Along this channel are placed additional channel networks called cakras. These cakras are associated with major aspects of our anatomy - for example our throat, heart, solar plexus, and in turn these aspects of our anatomy are related to aspects of our human nature.
According to the literature of kundalini yoga our experience of these centers is limited due to knots which restrict the flow of energy into these centers. Three knots are particuarly important. The knot of Brahma which restricts the center at the base of the spine. The knot of Vishnu which restricts the heart center and the knot of Rudra which restricts the center between the eyebrows. These knots form an important framework in yogic thinking and the stages toward enlightenment are articulated in terms of breaking through these knots in the yogic classic the Hatha Yoga Pradipika as well as in some of the yoga upanishads. Specifically, four stages of progress are described:
Arambha is associated with breaking the knot of Brahma and the awakening of kundalini.
Ghata is associated with breaking the knot of Vishnu and and with internal absorption.
Parichaya the absorption deepens and in
nishpatti the knot of Rudra is pierced and the kundalini may ascend to the center at the crown of the head. In this state transcendence is integrated and, according to the yogic liteature, the yogi has nothing more to attain.
Putting these elaborate physiological decriptions aside, the goal of kundalini yoga is the same as the goal of any legimitate spiritual practice: To be liberated from the limited bounds of the self-centered and alienated ego. In kundalini yoga this is associated with internal manifestations of the kundalini but the external manifestations should be similar to any other legitiimate spiritual practice.