Because it is Kali-yuga, nobody is reading, cultivating Vedic mantras. So in this age, this mantra is called maha-mantra, chant Hare Krsna. That’s all. All Vedic mantras are now gone to hell. Nobody can properly chant Vedic mantras and take the benefit out of it. But this mantra, any way you chant, neglectfully or properly, chant Hare Krsna and the result is there. Therefore Caitanya Mahaprabhu said: nasty eva nasty eva nasty eva gatir anyatha. There is no other alternative, no other alternative, no other alternative, kalau, in this age. So the Vedic mantra is now gone. This is also Vedic mantra, but this is Vedic maha-mantra, the greatest of all mantras. Yes. So sacrifice everything and chant this mantra and go to Krsna, back to Godhead.

From Srila Prabhupada’s lecture on Bhagavad-gita 2.13-17 — Los Angeles, November 29, 1968