Thematic Bible: Who is immature

And I, brothers, was not able to speak to you as to spiritual [people], but as to fleshly [people], as to infants in Christ. I gave you milk to drink, not solid food, for you were not yet able [to eat it]. But now you are still not able, for you are still fleshly. For where [there is] jealousy and strife among you, are you not fleshly, and do you not live like [unregenerate] people?

Concerning this {we have much to say and it is difficult to explain}, since you have become sluggish in hearing. For indeed, [although you] ought to be teachers {by this time}, you have need of someone to teach you again the beginning elements of the oracles of God, and {you have need of} milk, not solid food. For everyone who partakes of milk [is] unacquainted with the message of righteousness, because he is an infant.