Because milk is very essential food for the human society, therefore cow protection is the duty of the human society

Expressions researched:
"Because milk is very essential food for the human society, therefore cow protection is the duty of the human society"

Bhagavad-gita As It Is Lectures

As the king was entrusted to protect the life of the citizens, similarly, the vaiśya class, or the mercantile class, they were entrusted to protect the life of cow. Why particularly cow is protected? Because milk is very essential food for the human society, therefore cow protection is the duty of the human society. That is the conception of Vedic literature.

Lecture on BG 2.46-47 -- New York, March 28, 1966:

So the Lord says, Lord Kṛṣṇa says, that "According to your quality, you have to do your duty." You just... Just you can... Hereditary or by your own choice, you can have your own duty. But there is no question of that one should be idle. No. If you are intelligent class, then you have to take to intelligent quality of work, just like you must become a scientist, you must become politician, not politician, philosopher. You must be a religionist or so many intelligent class of work. So you must engage in that way if you are actually intelligent, if you belong to the intelligent class. Now, if you are administrative class, then you must take to the politics or election, be elected the mayor, be elected the president or something like that, and work in that way. And if you belong to the mercantile community, then you must do business and produce agricultural grains and distribute them. That is your business. In the Bhagavad-gītā you will find that the mercantile class... Who are mercantile class? Kṛṣi-go-rakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam (BG 18.44). Vaiśya means the mercantile community. They are meant for giving protection to the animals, and produce grain, and distribute and make trade on them. That's all. Because formerly there was no industry—people generally depended on agricultural work—therefore the mercantile community, they used to produce food grains and distribute them, and protection of cow was their duty. As the king was entrusted to protect the life of the citizens, similarly, the vaiśya class, or the mercantile class, they were entrusted to protect the life of cow. Why particularly cow is protected? Because milk is very essential food for the human society, therefore cow protection is the duty of the human society. That is the conception of Vedic literature.