Mantra is a way of controlling the mind and mystically centring yourself in god. If you dwell on the mantra, it saves you from some sora triate means saves mananat - thinking or contemplating it. Dwelling on negativeties just increases fed's power into them. It's much better to dwell on god if i am plagued by guilt,. that means i have the sensitivitya otherwise, once one loses one's sensitivity then we lose our sensitivity.