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.
Many people can study a lifetime and never reach the stage of going on unto perfection.
This is because they are dull of hearing. Being dull of hearing can often be related to some sin that a person does not want to give up. This sin deceives him. He is carnal, or worldly, or lukewarm. It is the church age that will be spit out.