Simply if the standard of our routine work is maintained very highly, that is, if we steadfastly perform our daily program of rising early, cleansing, chanting 16 rounds, holding kirtana wherever we are at least twice daily, reading, worshiping the deity, going on Sankirtana, like that–if this routine work is always done nicely and never neglected, then our all success is guaranteed in whatever we do. But if this our regular KC program is allowed to slacken, then everything else we try will fail. That is the simple formula for success.

(From Srila Prabhupada's letter to Kisora – Bombay 5 February 1972)