If one seeks the favor of a devotee instead of directly asking favors from the Supreme Personality of Godhead, one is very easily successful. Srila Bhaktivinoda Thakura has therefore recommended: vaisnava thakura tomara kukkura bhuliya janaha more, krsna se tomara krsna dite para. One should desire to become like a dog in strictly following a devotee. Krsna is in the hand of a devotee. Adurlabham atma-bhaktau. Thus without the favor of a devotee, one cannot directly approach Krsna, what to speak of engaging in His service.
From Srila Prabhupada's purport to SB 10.10.25