Brahmacārī means who are being practiced to the brahminical culture. So, there must be a portion of the population well versed in brahminical culture. Ekaś candras tamo hanti na ca tara sahasrasaḥ. Just like in a garden if there is one nice flower plant, rose, with good scent, the whole garden becomes flavored. You see? Scented.
Similarly, we do not expect that the whole population of the human society will be taking to this brahminical culture; but even one percent of the whole population accepts this brahminical culture, Kṛṣṇa consciousness, then the whole world will be peaceful. Not even one percent; less than one percent. It is so nice.
So Kṛṣṇa consciousness movement is very scientific movement. Unless you raise the population from the animal propensities, how you can expect peace? Do you think is there any peace in the dog society, in the cat society? No, it is not possible. You keep some dogs. They meet. As soon as they meet together there will be howling—"gow, gow, gow, gow." So you cannot expect. If you create dog society, then you cannot expect. You have to create a portion, a certain percentage of the population, brahmins. Then there is possibility.
Just like in the sky the numerical strength of the stars are greater, but there is one moon. That one moon is sufficient to illuminate the sky. Ekaś candras tamo hanti na ca tara sahasrasaḥ. Millions of millions of stars twinkling, they cannot dissipate the darkness. You see? Only one moon, only one sun. So try to make some percentage of the population actually brahmin. Go-brāhmaṇa-hitāya ca. And protect the cows.
Actually, we are taking so much advantages. So from the cows, the milk. And from the milk we can make hundreds of vitaminous foodstuff. Hundreds. They're all palatable. So such a nice animal, faithful, peaceful and beneficial. After taking milk from it, if we kill, does it look very well? Even after the death, the cows supply the skin for your shoes. It is so beneficial. You see. Even after death.
While living, he gives you nice milk. You cannot reject milk from the human society. As soon as there is a child born, milk immediately required. Old man, milk is life. Diseased person, milk is life. Invalid, milk is life. So therefore Kṛṣṇa is teaching by His practical demonstration how He loves this innocent animal, cow.
So human society should develop brahminical culture on the basis of protecting cows. The brahmin cannot take any other food except it is made of milk preparation. That develops the finer tissues of the brain. You can understand in subtle matters, in philosophy, in spiritual science. Just like in a scientific college, not ordinary man can understand the scientific intricacies.
They require some preliminary qualification to enter into the scientific college. They require some preliminary qualification to enter into the law college, in the postgraduate classes. Similarly, to understand the subtle or finer implications of spiritual science, one has to become brahmin. Without becoming brahmin it is not possible.