Hebrews 5:11-14 - Advanced Teaching Hindered By Immaturity
11 Concerning him I have much to say, and much that is hard to make clear to you, because you have grown dull of hearing. 12 And this too, although you ought by this time to be teaching others, you are still needing some one to teach you the very rudiments of divine revelation. You need milk, not solid food. 13 For every one who feeds on milk is inexperienced in the word of righteousness. He is still an infant. 14 But solid food is for adults, that is, for those who by constant practise have their faculties trained to discriminate between good and evil.