text called "Mandukya Upanishad"
says that AUM is the Atma or Soul who is the owner
and controller of each human being and residing in
the heart .
Further Mandukya Upanishad explains that the three
components of OM viz. AUM are representing three states
i.e. wakeful, (conscious), dream (subconscious) and
dreamless sleep (unconscious).
The fourth component as explained stands for "Turiya", a state which is beyond the above three
Upanishads had explained the detail procedure of meditating
AUM, the immediate stages, the experiences and the
ultimate spiritual benefits.
is explained in Kathopanishad as follows.
The upanishad claims that goal which all the Vedas
equivocally proclaim, which all the austerities speak
and write, for which people practice brahmacharya
it is this "AUM". AUM is a
root of all mantras.
"Mantras" is a typical combination of words
which affects the surrounding and human being through
the vibrations. These mantras are to be chanted for
enormous number of times to get the results. The results
are miraculous. AUM is a mantra with only one syllable
but is the basic mantra. Each and every mantra starts
with AUM and mostly ends with AUM.