Book excerpt: Lokmanya Tilak declared the purport of the Bhagavad-Gita as, 'the Karma Yoga founded on knowledge, in which devotion is the principal factor.' Author-Scientist, Prof. Arun Tiwari presents this new manifestation of Shrimad Bhagavad Gita Rahasya written by Lokmanya Bal Gangadhar Tilak with the objective to give the new generation a sense of purpose, determination, good moral values and a sense of duty & responsibility.