Mantras can direct the mind into a higher vibratory frequency

In its most rudimentary form, a mantra is made of syllables that exert their influence by means of sound (vibrations). As one would have personally experienced, different syllables have different vibration patterns which affect different parts of the body. Each syllable resonates with a certain organ or part of the body. Every thought or feeling that we have is on a vibratory frequency. By using mantras we can direct the mind into a higher vibratory frequency. For thousands of years, mystics and yogis have used mantras for mental and spiritual transformation

For example, by chanting “aaaaaaa”, one can feel the sensation and hence resonance of the nervous system in the stomach and chest region.

Chanting “ooooo” creates sensations in the throat & chest region and resonates with them.
Similarly, chanting/humming “mmmm” resonates with the nasal cavity as well as in the skull/brain region.

when we concatenate (join together) the above syllables into one mantra. We get the AUM mantra which when chanted sequentially activates the stomach, spinal cord, throat, nasal, and brain regions. The energy moves from the abdomen all the way up to the brain, thereby channelizing energy and activating the spinal cord and brain.

One of the most popular claims made by Yogis is that chanting the Om mantra improves our concentration, gives peace and steadiness to our mind, reduces mental stress, and clears all worldly thoughts.