Milk is undoubtedly very good and nourishing, but when it is touched by the mouth of a snake it is no longer nourishing; rather, it becomes a source of death. Similarly, those who are not strictly in the Vaishnava discipline should not make a business of this Bhagavad Gita and become a cause of spiritual death for so many hearers. In the Bhagavad-gita the Lord says that the purpose of all the Vedas is to know Him (Lord Krsna), and Srimad-Bhagavatam is Lord Sri Krsna Himself in the form of recorded knowledge. Therefore, it is the cream of all the Vedas, and it contains all historical facts of all times in relation with Sri Krsna. It is factually the essence of all histories. - SB 1.3.41
