Nirguna is one of the two types of
meditation taught in
yoga (and
Buddhism). It is meditation focused on the
Absolute. Only through Nirguna is a one able to achieve
Nirvana. Through detachment from the five senses and a still mind, one can maintain focus on something abstract. These abilities can be achieved by practicing Saguna, meditation with form. Nirguna is considered to be formless or objectless meditation. Two
mantras to be used during Nirguna are Om (ohm), the root of all sounds and letters, and Soham (soh-hum) which means "I am That" or at one with with the Absolute.
"The purpose of life is to fix the mind on the Absolute"-Swami Vishnu-devananda