This movement is not a sentimental movement. It is the scientific movement. It is the most elevated, scientific movement. If you are a scientist, you can question. Here is scientist present. He will answer you scientifically. Don't take this movement as some something sentimental. Authorized movement. We are speaking the science which is given by Kṛṣṇa, the Supreme Authority. So here Kṛṣṇa is giving you the idea, how you can get out of this material entanglement. Vīta-rāga-bhaya-krodhāḥ (BG 2.56). In the material life we are attached to four things: āhāra-nidrā-bhaya . . . bhaya means fearfulness. So the fearfulness must be there. Because we accepted this material body, there must be always . . . we must be always afraid. Not only we, even a small ant or birds and beasts, everyone. Sadā samudvigna-dhiyām asad-grahāt (SB 7.5.5). Always full of anxiety. Why? Asad-grahāt. Because we have accepted this body, asat. Asato mā gama, sad gama. That is the Vedic injunction. "Don't keep yourself in this asat material world." Sad gama. Jyotir gama. Tamasi mā. These are the Vedic injunctions.
So here Kṛṣṇa says that, "Many people . . ." Bahavaḥ. Not only one or two. Kṛṣṇa says, bahavo jñāna-tapasā. Jñāna, knowledge, and tapasā, austerities. So this human life is meant for jñāna and tapasā. Then we become purified. Jñāna-tapasā pūtā. Pūtā means purified. We have to purify our existence. This is human activity. Just like we are training. We are training our students how to become purified: no illicit sex life, no intoxication, no gambling . . . and what is the other?
Brahmānanda: No meat-eating.
Prabhupāda: No meat-eating. You have to purify yourself. That is the injunction of all Vedic literature.