‘Man’ means mind ‘tra’ means deliverance. Mantra means to deliver the mind, so thinks Hare Krishna is the great mantra because… there are many mantras which are secret which cannot be chanted by everyone and anyone because there are so many rules and regulations for chanting those: gayatri mantras bija mantras, but this is called maha-mantra because any one can chant or repeat. The process is simple you just have to repeat,

Hare Krishna Hare Krishna
Krishna Krishna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare

HH Jayapataka Swami Maharaja

June 5th 1983, Atlanta