Of whom we have many things to say, and hard to explain, seeing you are dull of hearing. For when for the time you ought to be teachers, you have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of solid food. For every one that uses milk is unskillful in the word of righteousness: for he is a babe. But solid food belongs to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil. (Hebrews 5:11-14)