Rahasya Traya Saram

Swami Vedanta Desikan was a well-learned Vaishnava Saint and an exponent of Vedanta. He used to teach the Upanishads to his disciples in his house. As the tradition prevented womenfolk from listening to and learning Upanishads, Swami Desikan’s mother could not listen to any of his teachings.
In order to enable his mother to listen and learn Vedanta, Swami Desikan wrote a grantha called ‘Rahasya Traya Saaram’. The beauty of this great piece of literature is that, in spite of being the essence of Vedanta, this Grantha does not contain any Vedic or Upanishadic verses.