We read something correct: "Consider that someone is eating food that contains a variety of nutrients mixed with some others that are poisonous. It is not necessary to tell him what the good ingredients are. What is needed is a warning about what is harmful. So here, it is not necessary to emphasize the truths of the Bhagavad Gita [and all other religious books], but the deadly mistakes it includes" (L, 56).

(from the introduction)