The tradition of Mantra is Mantra-Chanting, what is known as Mantra Japa, and Manish explains how to use it in "listening-meditation," which can be a very powerful technique to soothe the mind, remain attentive and integrate the energy within.
Mostly, as we know, we live on the level of 'body and mind' and most of the energy goes into dealing with issues on these fields. So if Mantra is used in the right way, it has the capacity to take us beyond the physicality and the mental planes, to come in contact with the real being. Here is where the potential of 'mantra listening' comes in.
If we observe ourselves, we can see that our whole struggle in our outer life is to 'become something' and that is very, very exhausting. A meditation technique using Mantra can simply bring us into a space of "just-being" and that's the highest outcome of Mantra meditation technique, involving energy awakening, energy rising and energy settling.