The kundalini shakti, or the prana shakti–whichever you call it–is the aspect of the life force activated by yoga and meditation that burns away impurities.
These impurities are not “sins” in the typical Judeo-Christian view. They are very different.
These impurities are simply anything that blocks the experience and realization of this marvelous life force.
The force clears its own way, if you will, for fuller realization and manifestation. It makes itself clearer by “burning away” anything that shrouds it.
As we practice our yoga and mediation, may we all catch fire. It will help make everything clearer!
The Every Day Yogi 