Those who perform severe austerities and penances, those who give away all their possessions out of charity, those who are very famous for their auspicious activity, those who are engaged in meditation and mental speculation, and even those who are very expert in reciting the Vedic mantras are not able to obtain any auspicious results, although they are engaged in auspicious activities, if they do not dedicate their activities to the service of the Supreme Personality of Godhead. I therefore repeatedly offer my respectful obeisances unto the Supreme Personality of Godhead, whose glories are always auspicious.

Srimad-Bhagavatam (2.4.17), cited as CC Madhya 22.20, Srila Prabhupada’s translation