Lecture given by Dulal Chandra dasa on April 1th, 2010 in Winston Salem, NC on the Bhagavad-gita As It Is.Understanding the nature of the external material potency by the comparison to a imperishable banyan tree given by Lord Krishna in the 15th Chapter of Bhagavad-gita. Krishna recommends that one must cut down this tree of material attachment with the sword of knowledge.