Om (Aum): the cosmic sound

Om is the primordial vibration from which all creation arises — the “Creative Word” or Cosmic Sound. The sage Patanjali identifies it with the very expression of God, and meditators report inwardly hearing this great sound as they grow still. It is universal, impersonal, the hum of the whole manifested universe. (Yogananda discusses it in The Science of Kriya Yoga.)

So’ham / Hamsa: the breath of the soul

Where Om is cosmic, So’ham is intimate. It means “I am That” — the recognition that the individual soul and the infinite Spirit are one. Remarkably, this mantra is said to be sounded by the breath itself: so on the natural inhalation, ham on the exhalation. Reversed, the same syllables form Hamsa — the swan, ancient symbol of the liberated soul that can separate milk from water, the real from the unreal.

How they relate

So’ham/Hamsa is the bridge between the individual and the cosmic: by riding the natural mantra of the breath, the meditator’s awareness is carried inward until it merges into the cosmic vibration of Om. The two are not in competition — they are stages of one ascent, from the personal breath to the universal Word.

Their place in Kriya Yoga

This inner work with breath and sound is precisely the territory of Kriya Yoga, which uses subtle techniques of breath and attention to still the mind and reveal the inner light and sound. To explore the practice further, see the eight limbs of yoga and our Start Here guide.

The two mantras in Kriya practice

These two great sounds work in different ways. Om (Aum) is the cosmic vibration, the hum of creation itself — in Kundalini Kriya Yoga it is approached through the Omkar Kriya, listening within to awaken and purify each chakra. So’ham — “I am That” — is the natural mantra of the breath, silently affirmed with each in-breath and out-breath, dissolving the sense of separation from the Divine. One attunes you to the universal sound; the other reveals your own identity with it. Both lead to the same silent source.