1. Chanting Hare Krsna is encouraging, not exhausting

    If one repeats monotonous material words, he will feel exhausted, but if he chants Hare Krsna twenty-four hours a day, he will never feel exhausted; rather, he will feel encouraged to continue chanting more and more.

    (From Srila Prabhupada's purport to SB 3.21.22)