And chanting mantras can help you in staying focused and centered on whatever mission or goal you are trying to achieve and pursue. The plan of using mantras invokes a specific quality of light, peace, or joy. If you know the real inner essence of mantras, you will be able to make your meditation more soulful and powerful.  In other explanation, mantras are energy based sounds. The metaphysical tradition of the Indians explains that bodies are composed of combined five elements and one of them is sound.