Babies need milk to survive and to thrive. And newborn babies need and crave it a lot. So too, those who have been spiritually born-again need spiritual milk so that they can grow and be mature. As believers grow, they will begin to enjoy more solid spiritual food. But here Peter is addressing our appetites?those things we desire and crave. He gives us a three-part instruction that will curb and train our appetites in such a way that maximum growth will be achieved.