This Upanishad forms a part of the Brahmana belonging to the Katha Shakha of the Krishna Yajur Veda. It stands in a class by itself. It combines charming poetry
Upanishads, in the words of Adi Shankaracharya, are known as Ātmavidyā (knowledge of the self) or Brahmavidyā (knowledge of Brahma). This ancient and timeles