SB 3.32.40

Persons who are always planning to do harm to others or putting violence to other living entities are not eligible for understanding Krsna consciousness or can enter into the realm of transcendental loving service of the Lord. Then again, there are so-called disciples who become submissive to the spiritual master most artificially, with an ulterior motive, cannot also understand what is Krsna consciousness or devotional service. Persons who on account of being initiated by other sect of religious faith and do not find devotional service as the common platform for approaching the Supreme Personality of Godhead cannot also understand Krsna consciousness. We have got practical experience that many students come and join us but at the end of being biased in some particular type of faith, they go out from the camp and is lost in the wilderness. Actually, Krsna consciousness is not a sectarian religious faith; it is a teaching process for understanding the Supreme Personality of Godhead and our relation with Him. So anyone can join this movement without any prejudice, but unfortunately there are persons who understand it differently. Therefore, it is better not to instruct the science of Krsna consciousness unto such persons.

Generally, materialistic persons are after some name, fame and material gain. So if somebody takes Krsna consciousness for the matter of name, fame and material gain, he will never be able to understand the philosophy. Such persons take to religious principle as a social decoration. They admit into some cultural institution for the sake of name only, especially in this age. Such persons also cannot understand the philosophy of Krsna consciousness. Even one is not too greedy for material possession but if one is too much attached to family life, they also cannot understand Krsna consciousness. Such persons may superficially may not very greedy for material possessions, but they are too much attached to wife, children and family improvement. When a person is not contaminated by the above-mentioned different kinds of faults but at the ultimate end if he is not interested in the service of the Supreme Personality of Godhead or a non devotee, he also cannot understand the philosophy of Krsna consciousness.