This is the work of Rūpa-Gosvāmī (1489–1564) we know as Śrī Bhakti-Rasāmṛta-Sindhu, a fundamental work on Devotional service, Bhakti, it’s inner meanings, psychology, degrees of transformed Consciousness and things favourable to this perfection of consciousness from average karmic – influenced consciousness driven by natural tendencies towards absolutely purified Divine Consciousness, the Consciousness perfected in a pure and humble devotional service to supreme Personality of Godhead.