"Mantras are not small things, mantras have power. They are the mind vibration in relationship to the Cosmos. The science of mantra is based on the knowledge that sound is a form of energy having structure, power, and a definite predictable effect on the chakras and the human psyche." ~ Yogi Bhajan

There is a vibratory frequency that corresponds to everything in the Universe. Happiness or sorrow, joy or regret are vibratory frequencies in the mind. When we chant a mantra we are choosing to invoke the positive power contained in those particular syllables. Whether it’s for prosperity, peace of mind, increasing intuition, or any other possible benefits inherent in mantras, simply by chanting them we are setting vibrations into motion that shall have an effect. It doesn’t actually matter if we understand the meaning of the sounds or not.

Chanting mantra produces specific vibratory frequency within the body. The vibratory frequency of a mantra draws to you whatever you are vibrating. You are like a magnet attracting vibrations to you by what you send out. As a vibration, a mood, a state of being that results from chanting, mantra is compatible with all belief systems.

http://www.3ho.org/may-2013-kundaliving-power-mantra