1. The most sublime religion for this age

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

    hare krsna hare krsna
    krsna krsna hare hare
    hare rama hare rama
    rama rama hare hare

    itisodasakam namnam
    kali -kalmasa-nasanam
    natah parataropayah
    sarva-vedesu drsyate

    “After searching through all the Vedic literature one cannot find a method of religion more sublime for this age than the chanting of Hare Krsna.”

    From Srila Prabhupada’s purport to Sri Caitanya-caritamrta Adi-lila 3.40