Krsna is supplying us with all facilities, so there is no question of scarcity of anything. Simply we must become Krsna conscious and conscientiously apply our energy to utilizing all facilities in the matter of pleasing Krsna or devotional service. We should always be very careful to avoid utilizing any of the facilities available for our own sense gratification, but we should use everything for the satisfaction of Krsna only.
Letter to Madhavananda, 3 June, 1970
The Pandavas were devotees, but at the same time, they were king. There was attachment. So therefore Krsna took away their everything - their kingdom, their wife, their position, their honor - test him, and still, they did not give up Krsna. Therefore they came out victorious. So Krsna sometimes tests His..., that how much one devotee is. He forcibly makes him renounced in order. That is Krsna's special favor.
Lecture on Srimad-Bhagavatam 1.13.11, Geneva, June 2, 1974
I am glad to see that my Thursday lectures have brought some changes in the mind of the young offenders. If the lectures are continued I am sure to turn these offenders into saintly characters. The means which I have adopted is spiritual and it works quickly than any material means. If you give me chance to speak to all the members of the Jayal, it is quite possible for me to turn them into ideal characters. In my next lecture on Tuesday the 5/6/62 morning, I would request you also to be present and see it personally how the transcendental medicine is acting upon them. I am just trying to make spiritual method as much practical as any other material cures with greater and persisting effect.
Letter to Sri Puri, 1 June, 1962
Tapasya means voluntarily accepting some inconvenience. Suppose I am accustomed to smoke or to drink. If I give it up, there will be certainly little inconvenience. But for the better cause, I have to suffer voluntarily. Nobody will die if he does not get facility for illicit sex or enjoying intoxicants and meat-eating. All the members of Krsna conscious society, they have given up. But for that reason we are not dying. It is not difficult. Simply we have to accept in the beginning there may be little inconvenience, but when you come to the platform, there is no inconvenience. So if we actually want to be cured from this diseased condition of repetition of birth, death, old age and disease, we have to abstain from this sinful life. So it is not difficult. It requires little knowledge.
Lecture on Bhagavad-gita 4.10, Festival at Maison de Faubourg, Geneva, 31 May, 1974
The whole idea is that Krsna wants Arjuna to become an ideal person, so that ordinary men can follow. And generally the practice is also the same. A leader of the man, if he is ideal, the followers also become ideal. And if the leader of the society or country is not an ideal man, then the followers or the countrymen or the members of the society, they are also of the same type.
Lecture on Bhagavad-gita 3.21-25, New York, 30 May, 1966
God has many names. It is not that you have to chant only "Krsna." No. If you have got any other name of God... Must be God's name. But they do not believe in God. Generally they think there is no God, or if there is God, God is dead. Something like that. And I don't think there is any definitive name in any other religious system. It is only in the Vedic system there is name. So anyway, if somebody thinks that "This Krsna is an Indian name. Why shall I chant 'Krsna'?" Well, you chant any other name, but it must be God's name. Then it will be effective.
Lecture on Srimad-Bhagavatam 6.1.30, Honolulu, 29 May, 1976
So far your question regarding Deity worship, during arati everything should be offered first to the Guru.
Letter to Giriraja, 28 May, 1972
Regarding your two questions, the first, Sri Gadadhara is expansion Radharani and Srinivasa is the expansion of Narada Muni, or in other words they are the internal and the devotional energy respectively.
Letter to Tamala Krsna, 27 May, 1970
If you have the desire to write poetry, better if you read one chapter of Krishna book very carefully. Then put it into poetry. But, do not concoct anything. There is no need for that type of poetry. If you do this, I think it will be appreciated nicely.
Letter to Vahna dasa, 26 May, 1975
Our philosophy is that you produce your food anywhere. You stay, and keep cows, take milk, produce vegetables, food grains, and chant Hare Krsna. That's all. This is our philosophy. Make your life successful. By becoming Krsna conscious, you become free from all these troubles of material condition. This is our education. Don't be after these motorcars, television, and all nonsense things, sporting, wine, women. Don't be after these. Simply eat sufficiently, keep your health nicely, chant Hare Krsna, realize Krsna, and go back to home. This is our philosophy.
Morning Walk at Villa Borghese, Rome, May 25, 1974