Om ॐ

It is said that if you cover your ears you will hear the sound of Om....the sound of the Universe.

The definition of mantra is "that which protects the mind." That which protects the mind from negativity, or that which protects you from your own mind, is called mantra. 

When you are nervous, disoriented, or emotionally fragile, chanting or reciting a mantra inspiringly can change the state of your mind completely, by transforming its energy and atmosphere. How is this possible? Mantra is the essence of sound, and the embodiment of the truth in the form of sound. Each syllable is impregnated with spiritual power, condenses a spiritual truth, and vibrates with the blessing of the speech of the buddhas. It is also said that the mind rides on the subtle energy of the breath, the prana, which moves through and purifies the subtle channels of the body. So when you chant a mantra, you are charging your breath and energy with the energy of the mantra, and so working directly on your mind and subtle body.

Excerpt by Sogyal Rinpoche, The Tibetan Book of Living and Dying

 So try it. Say it internally until you can say it out loud. With each exhale say Om.... just like the monks do, without any reservation or hesitation say Om.... until you feel the vibration throughout your entire body... Om....Om.....Om....Om.....Om......Om

Namaste~
Chica