Devotee: Śrīla Prabhupāda, if destiny cannot be changed, what does Kṛṣṇa mean when He says, "Be thou happy by this sacrifice."
Prabhupāda: Do you know what is meant by sacrifice?
Devotee: Sacrifice to Viṣṇu, to Kṛṣṇa.
Prabhupāda: Yes. That means to please Kṛṣṇa. If Kṛṣṇa is pleased He can change destiny. Karmāṇi nirdahati kintu ca bhakti bhājāṁ (Bs. 5.54). Sacrifice means to please Kṛṣṇa, yajña. Yajña means to please Kṛṣṇa. The whole, our Kṛṣṇa consciousness movement means to please Kṛṣṇa. That is the whole program. In all other business there is no question of pleasing Kṛṣṇa. When they declare war, one nation to another, there is no question of pleasing Kṛṣṇa. They're pleasing their whims. The two, big, big wars began, it was not for pleasing Kṛṣṇa. The Germans wanted that their sense gratification is being hampered by the Britishers, "Declare war." That means it was a war of sense gratification. "The Britishers are satisfying their sense gratification; we cannot do. All right, fight." So, there was no question of pleasing Kṛṣṇa.