Mahah is the syllable OUM. It is due to OUM that all the Vedas attain their power. Different types of the breath of life are bhuh, bhuvah and svar. Mahah is the foodgrains, it is beacause of foodgrains that life is sustained. Each of the fiur mantras is further subdivided into four mantras. (There are thus sixteen mantras in all.) He who utters these mantras, attains the brahman. All the gods bring gifts to a person who has attained the brahman.
"Upanishads"
