Thematic Bible: Who is immature

And the teaching I gave you, my brothers, was such as I was able to give, not to those who have the Spirit, but to those who are still in the flesh, even to children in Christ. I gave you milk and not meat, because you were, then, unable to take it, and even now you are not able; Because you are still in the flesh: for when there is envy and division among you, are you not still walking after the way of the flesh, even as natural men?

Of whom we have much to say which it is hard to make clear, because you are slow of hearing. And though by this time it would be right for you to be teachers, you still have need of someone to give you teaching about the first simple rules of God's revelation; you have become like babies who have need of milk, and not of solid food. For everyone who takes milk is without experience of the word of righteousness: he is a child.