12 Bible Verses about Spiritual Immaturity

And I could not speak to you, brothers, as I would to spiritual people, but [I have to speak to you] as I would to worldly people, for you are immature children in [the fellowship of] Christ.

[Now] we have many things to say about Melchizedek, but because of your slowness to grasp things, they are hard to explain. For certainly enough time has elapsed so that [by now] you ought to be teachers, [but instead] you are in need of having someone teach you again the basic principles of God's message. You have become people who need "milk" and not "solid food." [Note: The fundamental truths of Christianity are here figuratively spoken of as "milk," while the more advanced teaching, such as Christ's priesthood being like Melchizedek's, is called "solid food"]. For everyone who has to drink "milk" is inexperienced in the teaching about righteousness, for he is [still] a [spiritual] baby.read more.
But "solid food" is for mature people, who because of using their [spiritual] senses, have become able to distinguish good from evil.

For I fed you with milk, not with solid food [i.e., with basic fundamentals instead of more advanced teaching. See Heb. 5:12-13] because you were not able to absorb it,

Brothers, do not be children in the way you think, but be babies in wrongdoing; yet be mature in your thinking.

But as long as the person who has an inheritance coming to him is a child, he is really no better off than a slave, even though he himself is [rightfully] entitled [to the inheritance].

He is [still] under [the direction of] guardians and managers [of his affairs] until the day his father decides [to give him his inheritance].

So also, when we [Jews] were like children, we were under bondage to the basic worldly rules [of the law of Moses].

Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.

For certainly enough time has elapsed so that [by now] you ought to be teachers, [but instead] you are in need of having someone teach you again the basic principles of God's message. You have become people who need "milk" and not "solid food." [Note: The fundamental truths of Christianity are here figuratively spoken of as "milk," while the more advanced teaching, such as Christ's priesthood being like Melchizedek's, is called "solid food"].

[So], like newly born babies, you should desire the genuine, spiritual milk [i.e., God's word. See Heb. 5:12-13], so that by it you may grow toward [final] salvation,

for you are still worldly [minded]. And since there is jealousy and quarreling among you, is that not evidence that you are [still] worldly and living like [unspiritual] people?

I know about your deeds. (See, I have placed before you an open door, which no one can close). [Note: This probably refers to their being assured of some unspecified opportunity]. [I know] that you have [only] a little bit of strength, but [in spite of that] you have obeyed my word and did not deny my name.