Hebrews 5:12-14

Thomson(i) 12 For though by this time you ought to be teachers, you have need of some one to teach you over again the first elements of the oracles of God, and have need of milk and not strong food: 13 for every one who useth milk is unskilled in the doctrine of justification, for he is a babe, 14 and this strong food is for full grown men, who by long practice and exercise have their senses improved for the discernment of both good and evil.