3 Bible Verses about Immaturity

So I myself, brothers, could not deal with you as spiritual persons, but as creatures of human clay, as merely baby Christians. I fed you with milk, not solid food, for you could not take it. Why, you cannot take it even now, for you are still unspiritual. For when there are still jealousy and wrangling among you, are you not still unspiritual and living by a human standard?

I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses. For although you ought to be teachers of others because you have been Christians so long, you actually need someone to teach you over and over again the very elements of the truths that God has given us, and you have gotten into such a state that you are in constant need of milk instead of solid food. For everyone who uses milk alone is inexperienced in the message of right-doing; he is only an infant.

When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I laid aside my childish ways. For now we see a dim reflection in a looking-glass. But then we shall see face to face; Now what I know is imperfect, but then I shall know perfectly, as God knows me.

Brothers, stop being children in intelligence, but as to evil keep on being babies; and yet as to intelligence be men of maturity.

So I myself, brothers, could not deal with you as spiritual persons, but as creatures of human clay, as merely baby Christians. I fed you with milk, not solid food, for you could not take it. Why, you cannot take it even now,

So when we were spiritually under age, we were slaves to the world's crude notions,

I mean this: As long as the heir is under age he is not a whit better off than a slave, although he is heir of all the property, but he is under guardians and trustees until the time fixed by the father.

For although you ought to be teachers of others because you have been Christians so long, you actually need someone to teach you over and over again the very elements of the truths that God has given us, and you have gotten into such a state that you are in constant need of milk instead of solid food.

and like new-born babies thirst for pure spiritual milk, so that by it you may grow up to final salvation,

so that we may not be babies any longer, or like sailors tossed about and driven around by every wind of doctrine, by the trickery of men through their cunning in inventing new methods of error.