One who loves Krishna will give Him whatever He wants, and he avoids offering anything which is undesirable or unasked for. Thus, meat, fish and eggs should not be offered to Krishna...Vegetables, grains, fruits, milk and water are the proper foods for human beings and are prescribed by Lord Krishna Himself. Whatever else you eat, can not be offered to Him, since He will not accept it.
A. C. Bhaktivedanta Swami PrabhupadaIn spiritual life, one must conduct one's whole life under the guidance of the guru. Only one who executes his spiritual life under the direction of the spiritual master can achieve the mercy of Krishna.
A. C. Bhaktivedanta Swami PrabhupadaIt is said about Lord Buddha sadaya-hrdaya darsita-pasu-ghatam. He saw the whole human race going to hell by this animal killing. So he appeared to teach ahimsa, nonviolence, being compassionate on the animals and human beings. In the Christian religion also, it is clearly stated, 'Thou shall not kill'. So everywhere animal killing is restricted. In no religion the unnecessary killing of animals is allowed. But nobody is caring. The killing process is increasing, and so are the reactions. Every ten years you will find a war. These are the reactions.
A. C. Bhaktivedanta Swami PrabhupadaIf after accepting the spiritual master and being initiated one does not follow the rules and regulations of devotional service, then he is again fallen.
A. C. Bhaktivedanta Swami PrabhupadaOne should not be happy or distressed over desirables and undesirables, knowing that such feelings are just created by the mind.
A. C. Bhaktivedanta Swami Prabhupada