First of all, there is no division of varṇas. Cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ (BG 4.13). According to quality, it can be done. But people are not interested. They want hodge-podge. Therefore they are suffering. They cannot systematically do anything. So when the system of varṇa and āśrama is destroyed . . . just like in Western countries there is no such thing as varṇa and āśrama. Therefore the varṇa-saṅkara, the hippies . . . that is varṇa-saṅkara. The varṇa-saṅkara . . . in the Bhagavad-gītā . . . if the varṇa-saṅkara increases, strīṣu duṣṭāsu varṇa-saṅkaro vibhavate. When women become polluted, no fixed-up husband—that is pollution for a woman; no chaste, no chastity—then this varṇa-saṅkara will come out. And when the world is overpopulated by varṇa-saṅkara, it will become a burden. Therefore it so became, atheist, varṇa-saṅkara, demons. So it was unbearable by the earthly planet. And it is said, yadā yadā hi dharmasya glānir bhavati bhārata, tadātmānaṁ sṛjāmy ahamv (BG 4.7). Therefore mother earth went to appeal, "Please come and save me. I am very much overburdened." Therefore it is said, bhārāvatāraṇāya: "diminish."
So five thousand years ago Kṛṣṇa came to kill some of the demons. Not all of them were demons. But next time when Kṛṣṇa will come, it will be only demons. Only demons. Kalki avatāra. What is that stotra? Keśava dhṛta-kalki-śarīra jaya jagadīśa hare. So at that time Kṛṣṇa will not preach Bhagavad-gītā. Kalki avatāra will simply come to cut the throat only. That will be the preaching. That will be preaching. Mleccha-nivaha-nidhane kalayasi karavālam (Daśāvatāra Stotra 10), karālam. Karālam means death personified. Mleccha-nidhane. Mleccha means meat-eaters. Those who are meat-eaters, fish-eaters, they are mlecchas. Mleccha-yavana, they are called, according to Vedic . . . so people are becoming meat-eaters nowadays. I have . . . there is no secrecy.