When we are chanting prayers and mantras,we are invoking a feeling of closeness to a particular Buddha,which could take on the aspect of compassion,wisdom or even wrath, with Mahakala and Kalarupa exhibit.So when we recite mantras and prayers to Dorje Shugden who is the personification of diamond like indestructible power, Vajra power is appearing to the "minds' of those who think of this mantra.This phrase which gives confidence,energy to reach the final goal of Enlightenment,liberation from Samsara.
Thank you Vajratruth for sharing these holy verses.