Prabhupāda: Love of Kṛṣṇa cannot be stopped by any material reason. That is love. Nobody can say that "For this reason I could not love Kṛṣṇa." There is no reason. There is no impediment for anyone. Any circumstances. So any religious principle which helps a person to love Kṛṣṇa and God, in that way, without any reason, without any impediment... Just like flow of the river. There is no impediment in this world which can stop the flow of the river. Or the waves of the Pacific Ocean. There is no power in the material world which can stop the waves going on, going on, going on. You see?
(Srila Prabhupada Conversation, San Francisco, April 1, 1969)