This document provides the copyright notice and preface for the book "Nectar of Instruction" by A.C. Bhaktivedanta Swami Prabhupada. It explains that the book was written to guide followers of the Krsna consciousness movement according to the teachings of Srila Rupa Gosvami. It emphasizes the importance of controlling the urges of speech, mind, anger, tongue, belly and genitals in order to advance in spiritual life and qualify to become a spiritual master.