This book is published by Ramakrishna Math in Telugu written by Swami Ranganathanda on the Interpretation of Upanishads in the light of modern thought and needs
The essence of all the contents of the Upanishad Sarasvatam appears in Isha, Kena and Kathopanishads. So the author of the book chose three Upanishads and thoroughly discussed them in this book. It is indisputable that the message of these Upanishads bestows humanity with strength, security, unity, harmony, love and service. It is not far from the truth to say that we have not understood and digested the sublime thoughts of these Upanishads in this land itself.