The Upanishads

So'ham - I Am That

The natural mantra of the breath.

So'ham is heard in the natural breath - 'So' on inhalation, 'Ham' on exhalation. It affirms 'I am That' - the identity of individual and cosmic Self.

With each breath, the jiva unconsciously affirms its identity with Brahman.

So'ham meditation uses the natural breath as mantra.

Various Upanishads