One should not be idle but should be very enthusiastic about executing the regulative principles. Neglect of the regulative principles will destroy devotional service. In this Krishna consciousness movement there are four basic regulative principles, forbidding illicit sex, meat-eating, gambling and intoxication. A devotee must be very enthusiastic about following these principles. If he becomes slack in following any of them, his progress will certainly be checked. — The Nectar of instruction, Text 03.