A sadhu will not allow any kind of killing. See in the Christian religion, it is first injunction is "Thou shalt not kill." If you want to become religious… They are simply killing, and still, they are claiming "Christian." What kind of Christian? Simply their business is killing. So it is very difficult to find out a Christian, although they are claiming, I am "Christian." It is very difficult. Because their business is killing. And Lord Jesus Christ ordered, first order is, "Thou shalt not kill. Thou shalt not covet." Who is following?
So sadhu is suhrdam sarva-bhutanam. Why he should allow animal killing? They are also living entities, but for their benefit, the so-called sadhu says, "The animal has no soul." What is this nonsense? Animal has no soul? Why? What is the difference between animal and man? What are the symptoms of possessing the soul? They are all equal. The man also eats, the animal also eats. The man also sleeps, the animal also sleeps, the man also have sex life, the animals also have sex life. The man also defends, the animals also defends. So where is the deficiency that you say that the animal has no soul?
Imperfect knowledge. Or making adjustment for their own benefit. Now they are making correction: "Thou shalt not kill," "Thou shalt not murder." That means it will come to human being. But the actual commandment is "Thou shalt not kill." But these Christian people, they are making some amendment, "Thou shalt not murder." Because murder will apply to the killing of human beings. But Lord Jesus Christ never said like that. "Thou shalt not kill." It is applicable both for human being and for animal or even for trees. Unnecessarily you cannot kill. That is sadhu. Suhrdam sarva-bhutanam [Bg. 5.29]. "Don't kill my brother, but you can kill my neighbors." Not like that. He is not sadhu. Sadhu is kind to all living entities.
Krsna consciousness means to become kind to everyone. Therefore we say, "No meat-eating." Meat-eating means killing the animals. Killing the animals. Why you shall kill animals? You have to take Krsna prasadam…
It is not so easy thing that "I do everything, whatever I like." Some rascals preach that "Oh, religion has nothing to do with your eating. You can eat anything you like, and still you become a religious man." This is all nonsense. Nobody can become religious man if he is attracted by sinful activities. It is not possible.
You must stop sinful activities. That is first condition. Otherwise you cannot understand what there… Perhaps, in this Krsna conscious, except this Krsna conscious movement, all rascals, they do not know what is God. They have no clear conception of God. Because they are sinful.
From Srila Prabhupada's lecture on Bhagavad-gita 1.21-22 — London, July 18, 1973