Caitanya Mahāprabhu, challenged the Kazi, Muhammadan that, "What is your religion, that you eat your father and mother?" This was the challenge by Śrī Caitanya Mahāprabhu. Now, "What is that, father and mother?" Now, "Mother, your cow is your mother. You drink milk of cow. And the bull is your father. Because without bull, without the cow and bull being united, there is no milk. So how is that you are eating your father and mother?" It is a great challenge.
Actually those who are meat-eater, beef-eater, they are killing their father and mother and become implicated in sinful life. Therefore we say no meat-eating. No meat-eating. If you become implicated in sinful life, how you can be happy? There must be nature's punishment. Just like if you infect some disease, nature must punish you. You must suffer from the disease. You cannot get out. It is not possible. Kāraṇaṁ guṇa-saṅgo 'sya (BG 13.22). Why there are so many varieties of life? Why not one class of men, all President Nixon? (laughter) Why not? Why there is bum in the Bowery Street? In your country I am saying. Why there are arrangement of first-class, second-class, third-class, fourth-class, fifth-class men? Or animals, or trees? Everything is there. Why?
That is explained in the Bhagavad-gītā: kāraṇaṁ guṇa-saṅgo 'sya. As you have infected yourself with a particular type of modes of nature, you will get a body. That's all. If you have infected to get the body of a dog, you must be infected.