His spiritual senses are not exercised. He is not able to rightly understand or discern good and evil. He is carnal, not spiritual. He is not yet ready for strong meat, which is the doctrine of perfection. Many ministers will say that this or that is meat, and they are incorrect.
Meat is perfection.
It is not a diet suited for babes. This comes only after much time spent in the Word, and walking with Christ, and by going through many spiritual battles and testings, always using God s Word as our guide. As a result of these things, we begin to grow, and in process of time come to full age. If we are still learning the first principles, or first doctrines, then we have not reached the point where we are ready for the doctrine of perfection. We could not be considered a spiritual Christian that is able to understand or discern both good and evil.