Prabhupāda: We will go on. Caravan will pass. Let the dogs bark.
Dr. Patel: The dogs may bite.
Prabhupāda: No. Barking dog never bites. (laughter) Barking dog never bites. They simply make their show. Neither they can bite.
(Srila Prabhupada Morning Walk, Bombay, January 9, 1977)
Prabhupāda: So it is Kṛṣṇa's mercy. "You can do all kinds of opposition, but we shall go forward. The caravan will pass. You may bark." So take all these things as Kṛṣṇa's mercies and engage more enthusiastically. Why should we be defeated? Yuddhyasva mām anusmara (BG 8.7). Just remember Kṛṣṇa and fight. Bās. Fighting is... This material world is fighting. Manaḥ ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). The karṣati is struggle, but struggle for Kṛṣṇa. That is perfection. That's all.
Devotee: Jaya Śrīla Prabhupāda.
Prabhupāda: Thank you. Work very hard for Kṛṣṇa, one life.
(Srila Prabhupada Conversation, Calcutta, January 16, 1977)