OM SHANTI SHANTI SHANTI

OM is the supreme symbol of the Lord.
OM is the whole, OM affirms; OM signals
The chanting of the hymns from the Vedas.
The priest begins with OM; spiritual teachers
And their students commence with OM.
The student who is established in OM
Becomes united with the Lord of Love.

-Taittiriya Upanishad

From The Upanishads,