One who approaches the Supreme Lord to render devotional service, but who is proud of his personality, envious of others or vengeful, is in the mode of anger. He thinks that he is the best devotee. Devotional service executed in this way is not pure; it is mixed and is of the lowest grade, tämasaù. Çréla Viçvanätha Cakravarté Öhäkura advises that a Vaiñëava who is not of good character should be avoided. A Vaiñëava is one who has taken the Supreme Personality of Godhead as the ultimate goal of life, but if one is not pure and still has motives, then he is not a Vaiñëava of the first order of good character. One may offer his respects to such a Vaiñëava because he has accepted the Supreme Lord as the ultimate goal of life, but one should not keep company with a Vaiñëava who is in the mode of ignorance.

Sb 3.29.8