The original Vedic srutis and their derivative smrtis mostly reflect the general interests of human beings, who strive for material progress, rarely inquiring philosophically into the purpose of life. The confidential science of pure devotional service is taught explicitly only in a few Vedic scriptures little known to the public. Among these rare texts are the Gopala tapani Upanisad, the Narada Pancaratra, the Garga Samhita, the Visnu Purana, the Hari-vamsa ...