Beliefs are an integral part of who we are, and they play a determinant role in our mental health and physical well-being. But how do beliefs have such a profound influence and what physiological and psychological mechanisms are involved? Supported by new research, we'll explore fascinating data regarding the connection between religious/spiritual beliefs and health; the possible mechanisms at work to maintain such connections; how, both physically and psychologically, spirituality can enhance quality of life, how various spiritual interventions from prayer to meditation can be used in clinical practice.