(Goddess Kali—click to enlarge)
"Sometimes Kālī becomes so infuriated that she indiscriminately kills all kinds of asuras. There is a popular picture of goddess Kālī in which she wears a garland composed of the heads of the asuras and holds in her left hand a captured head and in her right hand a great khaḍga, or chopper, for killing asuras. Great wars are symbolic representations of Kālī’s devastation of the asuras and are actually conducted by the goddess Kālī."
(Śrīmad-Bhāgavatam 4.24.18, Purport)
"In this age of Kali the propensity for mercy is almost nil. Consequently there is always fighting and wars between men and nations. Men do not understand that because they unrestrictedly kill so many animals, they also must be slaughtered like animals in big wars. This is very much evident in the Western countries. In the West, slaughterhouses are maintained without restriction, and therefore every fifth or tenth year there is a big war in which countless people are slaughtered even more cruelly than the animals. Sometimes during war, soldiers keep their enemies in concentration camps and kill them in very cruel ways. These are reactions brought about by unrestricted animal-killing in the slaughterhouse and by hunters in the forest. Proud, demoniac persons do not know the laws of nature, or the laws of God. Consequently, they unrestrictedly kill poor animals, not caring for them at all. In the Kṛṣṇa consciousness movement, animal-killing is completely prohibited. One is not accepted as a bona fide student in this movement unless he promises to follow the four regulative principles: no animal-killing, no intoxication, no illicit sex and no gambling. This Kṛṣṇa consciousness movement is the only means by which the sinful activities of men in this Kali-yuga can be counteracted."
(Śrīmad-Bhāgavatam 4.26.5, Purport)
"You are maintaining so many slaughterhouse, and when it will be mature, there will be war, the wholesale murder. Finished. One atom bomb—finished. You'll have to suffer. Don't think that 'Innocent animals, they cannot protest. Let us kill and eat.' No. You'll be also punished. Wait for accumulation of your sinful activities, and there will be war, and the America will drop on Russia atom bomb, and Russia will be finished. Both will be finished. Go on now enjoying. It takes time. Just like even if you infect some disease, it takes time. Not that immediately you infect, and immediately the disease is there."
(Srila Prabhupada Lecture, Honolulu, May 31, 1976)
"Every ten or fifteen years there is a big war—a wholesale slaughterhouse for humankind. But these rascals—they do not see it, that by the law of karma, every action must have its reaction. You are killing innocent cows and other animals—nature will take revenge. Just wait. As soon as the time is right, nature will gather all these rascals and slaughter them. Finished. They’ll fight amongst themselves— Protestants and Catholics, Russia and America, this one and that one. It is going on. Why? That is nature’s law. Tit for tat. 'You have killed. Now you kill yourselves.' "
(Srila Prabhupada Conversation, Paris, June 11, 1974)
"You simply enjoy what is allotted to you. Don't encroach upon others' property. This is God's arrangement. You enjoy. As human being, you enjoy life. You have got food grains, fruits, flowers, milk. Enjoy life. Offer to Kṛṣṇa. Enjoy life. Why should you kill animal? That is God's... Tena tyaktena bhuñjīthā. He says, patraṁ puṣpaṁ phalaṁ toyam (BG 9.26). Why do you go to kill animals? That is not enjoyment. That means you will suffer; that is your suffering. You are creating suffering."
(Srila Prabhupada Conversation, Geneva, May 31, 1974)
"Animal killing is very prominent amongst demoniac people. Such people are considered the enemies of the world because ultimately they will invent or create something which will bring destruction to all. Indirectly, this verse anticipates the invention of nuclear weapons, of which the whole world is today very proud. At any moment war may take place, and these atomic weapons may create havoc. Such things are created solely for the destruction of the world, and this is indicated here. Due to godlessness, such weapons are invented in human society; they are not meant for the peace and prosperity of the world."
(Bhagavad-gītā As It Is 16.9, Purport)
"As soon as there is atomic bomb, everything, all civilization on the surface of the globe will be finished. So people may not like it. It may be very unpalatable, but the fact is like that. Satyaṁ brūyāt priyaṁ brūyāt ma brūyāt satyam abrūyāt. It is social convention that if you want to speak truth, you speak truth very palatable, flattering. Don't speak unpalatable truth. But we are not meant for that purpose, social convention. We are preacher, we are servant of God. We must speak the real truth. You may like it or may not like it, that a godless civilization cannot be happy in any stage. That is a fact. Therefore we have started this Kṛṣṇa consciousness movement to awaken this godless civilization, that you try to love God."
(Srila Prabhupada Lecture, Seattle, October 20, 1968)
"You are trying to develop yourselves, so please develop spiritually, for spiritual development is sound development. Don’t imitate the Americans and Europeans, who are living like cats and dogs. Such civilizations built on the consciousness of sense gratification cannot stand. The atomic bomb is already there, and as soon as the next war breaks out, all their skyscrapers and everything else will be finished. Try to understand this from the real viewpoint of human life, the spiritual viewpoint. This is what this Kṛṣṇa consciousness movement is about. We therefore request you to try to understand this philosophy."
(Science of Self-Realization, Chapter 7)
"You have asked about whether nuclear devastation on this planet would effect the Sankirtan Movement. No, there is nothing that can stop the Sankirtan Movement because it is the will of God Himself, Lord Caitanya, that His Holy Name be heard in every town and village. Neither can the demons devastate this planet independent of the will of Krsna. Nothing happens without His sanction. If Krsna wants to kill someone no one can save Him, and if Krsna wants to save someone no one can kill him. For our parts we should just be determined to carry out our mission against all opposition, demons, nuclear war, whatever. The whole universe is finally subject to certain annihilation by the will of Krsna, but devotional service is eternal and is the only certain way one can save himself from devastation. We can preach all over the world that the only way to be saved from collective and individual devastation is to take to the chanting of Hare Krsna. In short, this material world is a very precarious place therefore we should always chant Hare Krsna and seek Krsna's protection."
(Srila Prabhupada Letter, June 22, 1973)
Devotee: So Prabhupada, is there something we should do to prepare ourselves for this disaster?
Devotee: This coming war.
Prabhupada: You should simply prepare for chanting Hare Kṛṣṇa.
Devotee: That's all?
Prabhupada: That's all.
(Srila Prabhupada Conversation, Mayapur, April 4, 1975)