Sri Upadesamrita: By Sri Rupa Goswami

 
For the benefit of all living beings, Srila Rupa Gosvami churned the ocean of Śrīman Mahāprabhu’s instructions and extracted the essence in the form of this Śrī Upadeśāmṛta. Śrī Upadeśāmṛta gives indispensable instructions for practitioners of bhakti, the devotional path. Without following these instructions, entering the realm of pure devotion and especially following the intricate and elevated path of spontaneous devotion (rāgānuga-bhakti) is not only difficult but impossible.” [
Śrī Śrīmad Bhaktivedānta Nārāyaṇa Gosvāmī Mahārāja]