Hebrews 5:11-14 - Advanced Teaching Hindered By Immaturity
11 [Now] we have many things to say about Melchizedek, but because of your slowness to grasp things, they are hard to explain. 12 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"]. 13 For everyone who has to drink "milk" is inexperienced in the teaching about righteousness, for he is [still] a [spiritual] baby. 14 But "solid food" is for mature people, who because of using their [spiritual] senses, have become able to distinguish good from evil.