Hebrews 5:14 WBT

¹²  For when for the time ye ought to be teachers, ye have need of one to teach you again which [are] the first principles of the oracles of God; and are become such as have need of milk, and not of strong food.

¹³  For every one that useth milk, [is] unskillful in the word of righteousness: for he is a babe.

¹⁴  But strong food belongeth to them that are of full age, [even] those who by reason of use have their senses exercised to discern both good and evil.