In the practice of Tantra, mantras are used. The mandala of sound in the beginning, when one practices the mantra, one chants Om, Om, Om aloud and one can hear the sound. Later one does not utter the sound, but one can feel it.

Finally, one can hear Om reverberating through one’s body. The sound is manifested in one’s mind and it is real. It is referred to as the divine sound also known as the intuitive sound.

As explained by Swami Satyananda Saraswati.

Please try it. At the Meenakshi Temple in Madurai, I heard a devotee chanting Om loudly, without stopping and the sound resonated in the temple. Can you imagine how he must feel after finishing his sadhana.

Aim Hrim Klim