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Śrīmad-Bhāgavatam
[Canto 10, Ch. 1]
Even though animal sacrifices are sanctioned in Vedic ceremonies, men who kill animals for such ceremonies are considered butchers. Butchers cannot be interested in Kṛṣṇa consciousness, for they are already materially allured. Their only interest lies in developing comforts for the temporary body.
bhogaiśvarya-prasaktānām tayāpahṛta-cetasām vyavasāyātmikā buddhiḥ samādhau na vidhīyate
“In the minds of those who are too attached to sense enjoyment and material opulence, and who are bewildered by such things, the resolute determination of devotional service to the Supreme Lord does not take place.” (Bg. 2.44) Śrīla Narottama dāsa Thākura says:
manuṣya-janama pāiyā, rādhā-kṛṣṇa nā bhajiyā, jāniyā śuniyā viṣa khāinu
Anyone who is not Kṛṣṇa conscious and who therefore does not engage in the service of the Lord is also  paśu-ghna , for he is willingly drinking poison. Such a person cannot be interested in  kṛṣṇa-kathā  because he still has a desire for material sense gratification; he is not  nivṛtta-tṛṣṇa . As it is said,  traivargikās te puruṣā vimukhā hari-medhasaḥ . Those interested in  trivarga —that is, in  dharma ,  artha  and  kāma —are religious for the sake of achieving a material position with which to gain better facilities for sense gratification. Such persons are killing themselves by willingly keeping themselves in the cycle of birth and death. They cannot be interested in Kṛṣṇa consciousness.
For  kṛṣṇa-kathā , topics about Kṛṣṇa consciousness, there must be a speaker and a hearer, both of whom can be interested in Kṛṣṇa consciousness if they are no longer interested in material topics. One can actually see how this attitude automatically develops in persons who are Kṛṣṇa conscious. Although the devotees of the Kṛṣṇa consciousness movement are quite young men, they no longer read materialistic newspapers, magazines and so on, for they are no longer interested in such topics ( nivṛtta-tarṣaiḥ ). They completely give up the bodily under-