Om Namah Shivaya,
While reciting the Maha Mrityunjaya Mantra, the highest seekers pray to liberate their jeevas from the worst disease which is the cycles of life and death and to grant them Moksha (immortality). This requires devotion and faith; although initiation by a God realised Guru can be instrumental. Though widely used to gain cure for physical diseases or other physical benefits, the above is the ultimate strength and purpose of the Mantra- MOKSHA.