The chanting of the holy name is the most sublime religion for the Kali-yuga:

The Hare Krishna mantra is specifically mentioned in many Upanisads, such as the Kali-santarana Upanisad, where it is said:

hare Krishna hare Krishna

Krishna Krishna hare hare

hare rama hare rama

rama rama hare hare

itisodasakam namnam

kali-kalmasa-nasanam

natah parataropayah

sarva-vedesu drisyate

"After searching through all the Vedic literature one cannot find a method of religion more sublime for this age than the chanting of Hare Krishna." 
- (Sri Caitanya-caritamrta - 1975, Adi-lila, 3.40)

Srila Prabhupad ki Jai..\o/

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