Major or Mukhya Upanishads are twelve in number. Some scholars be-
lieve it to be only ten. These chief Upanishads
were commented by the great teacher Adi Shankaryacharya.
These are considered to be authentic source of ‘Sruti’.
Six among the twelve major Upanishad’s details are :
Chandogya – It is the oldest Upanishad having the principle philosophy
of the Vedas. It has 8 chapters and is associated with Samaveda. The
principle philosophy of this Upanishad is oneness of the inner self.
Brihadaranakya – This Upanishad is associated with Dark Yajurveda. The
Upanishad helps us to know about the actual identity of the inner self.
Isa – Shortest among the Major Upanishads. This Upanishad describes
nature of Lord (or ‘Ish’.
Kena – Kena means- by whom? Hence, this Upanishad is related to who
has made this world. This Upanishad is associated with Samaveda.
Prasna – The Upanishad Is related to Atharvaveda. There were six sages
who asked six questions to the Lord after their long penance. The Upani-
shad explains answers to the findings of the questions.
Taittyiriya – This Upanishad is connected to the Yajurvaveda. The Upani-
shad describes various modes of happiness and joy in life.
The other Major Upanishads are – Katha, Mundaka, Mandukya, Aitar-
eya, Brahma and Kaivalya.