"You have asked about 'chemical changes of consciousness' or drugs, and if these may ever be utilized in Krishna's service. To change consciousness, therefore the Spiritual Master is there. Do not do anything whimsically, like taking these drugs, that will ruin everything. Because you are imperfect you require help from the Perfect, and anything material like drugs is imperfect, so do not be distracted by contemplating in this way. This chemical is intoxicant, it will not help, it will send you to hell."
(Srila Prabhupada Letter, December 14, 1972)
"You have asked what is meant by illicit sex. Sex should be used only in marriage for begetting nice children to raise in Krsna Consciousness. Krsna says in the Bhagavad-gita that I am sex life performed according to religious principles. Sex life for any other purpose means illicit sex. The use of contraceptive method for sex enjoyment is very sinful. Restraint in the matter of these four sinful activities is achieved by tasting the superior mellows of Krsna Consciousness."
(Srila Prabhupada Letter, June 18, 1973)
"You have asked what is the mentality of the demons who attacked New Vrndavana and why did this happen? You should know this already, that there are two classes of men, devotees and demons. The whole history is that the peaceful devotees are disturbed by the demons but that the devotees are always victorious by the grace of Krsna. In the Bhagavad-gita Krsna ordered Arjuna to declare to the whole world that His devotees would never be vanquished. And in the last verse of the Gita, Sanjaya says wherever there is Krsna and Krsna's pure devotee Arjuna there will always be opulence, victory, extraordinary power and morality tatra srir vijayo bhutir dhruva nitir matir mama. But because we are engaged in warfare with the forces of Maya, there will be casualties. Even Arjuna's son, Abhimanyu a 16-year-old boy was killed at the battle of Kuruksetra. We should be prepared to protect the Deities and always expect Krsna's Mercy, because we are always dependent on Him and we cannot do anything on our own without Him.
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)
"You have asked 'How serious would it be for me if I should miss the golden opportunity to become your initiated disciple?' You should know that the value of accepting a bonafide spiritual master is more than we can calculate. It is not a mere formality. Of course everyone is encouraged to chant Hare Krishna, but until one gives up sinful activities and becomes determined to serve Krishna through His representative, then the firm fixing up of devotional service will not take hold, and there is every chance that one will fall prey to all sorts of material desires and have to come back again in the next life—and one cannot guarantee that he will be born in the form of life he may desire.
I know you have been attending our temple in Boston sometimes, and that you wish to be a sincere devotee of Krishna. So go on faithfully with you chanting and pray to Krishna to give you strength for advancing in His service. It is a fact, however, that we must become free of all material desire before going back to Godhead, and this can only be achieved by following the instructions of a bonafide spiritual master."
(Srila Prabhupada Letter, February 12, 1974)
"You have asked what is the origin of the black race. This is not an important question. Why should you be curious about the temporary body. If I am very interested in knowing about my clothing that I am wearing only temporarily it is not a very important thing. We have had many bodies which we change like sets of clothes; to be very absorbed in the present body one has, whether it is black or white or yellow is not the sign of a wise person or Krsna Conscious devotee. As to whether the personality of Kali was black, (African) may not have been so. After all, Krsna is black also, although His body, is different, He is sat cit ananda. So our inquiries should be on the point of Krsna not in references to the so called race or religion or nationality of this temporary miserable body."
(Srila Prabhupada Letter, May 1, 1974)
"As for your questions you have asked for clarification in the KRSNA Book when Maha Visnu says to Krsna and Arjuna that you are my incarnations in my appearance as Nara-Narayan. So you are asking how this can be so. The answer is when Krsna comes all the incarnations are within him. Actually this is a very intricate question. So not be so concerned about it now. When you become more advanced you will be able to realize these things."
(Srila Prabhupada Letter, May 12, 1974)
"You have asked me what I feel is the best engagement for you at this time and in response, I kindly request you to continue to distribute my books full-time. You are very expert in this matter and you can also teach others how to do it. At the present moment, the plays are not as important as our book distribution. So, my desire is that you increase your book distribution more and more and be blessed by Lord Caitanya Mahaprabhu."
(Srila Prabhupada Letter, February 2, 1975)
"You have asked how you can thank me. Whether you thank me or not, if you understand the importance of this Krishna Consciousness Movement, that is my success. The whole world is thinking in the bodily conception of life and thus remaining like animals. The animals cannot be happy but people want to keep themselves like animals. For peace they are barking in the United Nations. Croaking toads who think they are making a big conference, and then one day the snake of death comes and swallows them up.
If there is possibility to preach amongst the communists, you must do it immediately. The intelligent communist people will very easily understand our philosophy. We can convince them on the basis of samah sarvesu bhutesu, a Krishna conscious person is equally disposed to every living entity (BG 18.54). You become a communist and make the present imperfect idea of communism perfect. The idea of the communist philosophy is that the state should be benefited. But the state being imperfect, the living entities other than the human beings cannot derive any profit. It is therefore no better than the capitalists. For the benefit of the human beings, the capitalist kills the poor animals. Similarly, the communist does the same thing. Where is the difference? Perfect communism is in the Srimad-Bhagavatam wherein it is stated that you feel for the poor animals as well as the human beings. Srimad-Bhagavatam instructs that even if there is a snake or lizard in the house, it is the duty of the householder to see that they are also eating, not starving. So you have to begin your preaching with such broader idea of communism."
(Srila Prabhupada Letter, January 18, 1976)