This is the process. So this Bhakti-rasāmṛta-sindhu is the science of devotional service. If one wants to become a devotee of Kṛṣṇa, the Supreme Personality of Godhead...
When we speak of Kṛṣṇa, Kṛṣṇa means all Viṣṇu forms, all Viṣṇu forms. Rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan nānāvatāram akarod bhuvaneṣu kintu, kṛṣṇaḥ svayaṁ samabhavad paramaḥ pumān yo (Bs. 5.39). All incarnations, they are also Kṛṣṇa, expansion of Kṛṣṇa. But Kṛṣṇa, this Personality of Godhead, Kṛṣṇa, He's the Supreme Person. Īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). So these things are explained in the Bhakti-rasāmṛta-sindhu, as they are in the Bhagavad-gītā, Śrīmad-Bhāgavatam. The summary, the juice of Śrīmad-Bhāgavatam, Bhagavad-gītā, devotional service is given in the Bhakti-rasāmṛta-sindhu. We have translated this book as Nectar of Devotion. And you'll be pleased to hear that in some of the universities in U.S.A. this book has been recommended as study book in the religious class. They're now reading regularly.