The author had quoted from this Upanishad and explained its ideas in several of his lectures, class-talks, and conversations. All this material, spread throughout the nine volumes of his Complete Works, has been brought together in this book for the first time. What makes this compilation a treasure trove of original ideas and masterly insights is that the author goes straight to the heart of the subject to focus on the essentials, and to evolve practical methods from abstract principles.
Be brave! Be strong! Be fearless! Once you have taken up the spiritual life, fight as long as there is any life in you. Even though you know you are going to be killed, fight till you are killed. Don't die of fright. Die fighting. Don't go down till you are knocked down.
-Swami Vivekananda