click on image to enlarge
..utilize everything for the purpose of Kṛṣṇa. That is Kṛṣṇa consciousness movement. Most scientific and authorized movement. Trying to place people in his original, constitutional position and cooperate for the service of Kṛṣṇa. That is Kṛṣṇa consciousness movement.
…So bhakti-rasāmṛta-sindhu is to taste the mellow of serving Kṛṣṇa. That is the science of serving Kṛṣṇa. Therefore we have named this book, “Nectar of Devotion.” It is summary study of bhakti-rasa, the mellow, the transcendental mellow which one can taste. Everyone is tasting. Otherwise he cannot work. So yat karoṣi yaj juhoṣi. Kṛṣṇa says, “Whatever engagement you may have, kuruṣva tad mad-arpaṇam, do it for Kṛṣṇa.” Don’t take the result yourself. Give it to Kṛṣṇa. Then you’ll taste the rel…, relish the mellow, transcendental mellow, bhakti-rasa. And then you’ll be happy. (The Nectar of Devotion Lectures Vṛndāvana, October 17, 1972)
Full Lecture More
The Hare Krishna Movement 