Heart of Wisdom is based on an oral commentary to the Essence of Wisdom Sutra (the Heart Sutra), which was given by the author at Manjushri Mahayana buddhist Centre in England. The Heart Sutra, one of the best known and most popular of Mahayana Buddhist scriptures, contains the essence of Buddha's teachings on emptiness and the methods to develop the wisdom that understands this ultimate reality. In this highly acclaimed explanation of the Sutra, Geshe Kelsang reveals its explicit and implicit meanings with both clarity and authority, and relates them to the five Mahayana paths that lead to full enlightenment. Seen in modern light, Buddha had been able to perceive, even "see" the vast spatial distances between atoms and between sub-atomic particles "filled" with electrons and even sub-eletrons in a state of high vibration. This atomic condition corresponds to a similar pattern in the brains of living beings and to interstellar and interplanetary gaps. The subject of emptiness as the author explains deals with perceptions leading to concept of formation and creation of a world of sense ideas which is merely a random arranging of material resources in an otherwise empty space filled with vibrations of these very particles. This is a rather difficult subject handled facilely by the author.