The sage-author Swami Brahmananda in this commendable book expounds 101 important vidyas culled from the twelve major Upanishads,presenting the hidden and secret instructions on the Supreme Truth.A fund of wisdom lies deep within his words,which carry tremendous spiritual behind them. As said the ancient sage Pippalada,one might well imagine Swami Brahmananda saying,"O my dear disciple,I now tell you that Supreme Brahman to be known only from the Upanishads.Having heard it,you should now realise it through proper reflection and deep meditation...There is nothing more to be known besides this knowledge of Brahman.For by knowing This,you know everything."