This is what it does for me in my practice -
In Buddhism, prayer is primarily utilized for its internal purposes. It is practiced to awaken the practitioner’s inner bodhicitta, or Buddha nature. This concept can be defined as the fundamental compassionate vital energy; an energy that is as much present in the cosmos as it is within the individual. The process of prayer aids the practitioner in uniting himself with the cosmos by awakening this inner energy and consequently tapping into otherwise unused sources of wisdom, empathy and knowledge. The various types of meditative Buddhist prayer serve to calm the mind; bringing it to a state conducive to developing a strong and compassionate heart.