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.
Seek ye first the kingdom of God, and everything else shall be added unto you. This is the one great duty, this is renunciation. Live for an ideal, and leave no place in the mind for anything else.
-Swami Vivekananda