Thematic Bible: Those that are full of age

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. read more.
But solid food is for the mature, who because of practice have trained their faculties for the distinguishing of both good and evil.