Prahlāda Mahārāja was asked by his father, "How did you develop this Kṛṣṇa consciousness?" So he replied that naiṣāṁ matis tāvad urukramāṅghrim (SB 7.5.32): "This Kṛṣṇa consciousness cannot be developed . . ." Spṛśaty anartha upasamo yad-arthaḥ. Kṛṣṇa consciousness, development of Kṛṣṇa consciousness, means anartha upasama. Anartha means things we do not require. Anartha. Artha, anartha. Artha means which is essentially required, and anartha means which is not required; artificially we have requisitioned.
So when one grows his Kṛṣṇa consciousness, immediately his artificial life becomes finished. Bhaktiḥ pareśānubhavo viraktir anyatra syāt (SB 11.2.42). This is the symptom of development of Kṛṣṇa consciousness, that he's not any more interested for material, unnecessary things. This is the test. If one is increasing Kṛṣṇa consciousness, at the same time he has got full attachment for material things, that means he's not developing. Material things means āhāra-nidrā-bhaya-maithunaṁ ca: eating, sleeping, mating and defending.
So sometimes the karmīs are afraid of this Kṛṣṇa consciousness movement, because they know that as soon as one becomes Kṛṣṇa conscious, he is no more interested with these material things. Just like we say: "Don't eat meat." So actually, if all people become Kṛṣṇa conscious and give up meat-eating, then the slaughterhouse will be closed. Automatically. We say no meat-eating and no intoxication. So if all people become Kṛṣṇa conscious and give up drinking and smoking, the big business—breweries and cigarette manufacturers—will be closed.