Hebrews 5:12-14

Godbey(i) 12 For indeed you, who ought to be teachers so far as time is concerned, have need that some one again teach you what are the rudiments of the beginning of the oracles of God; and you have need of milk, not solid food. 13 For every one partaking of milk is unskilful in the word of righteousness; for he is a babe; 14 but solid food belongs to the perfect, those having their senses disciplined by use unto the discernment both of the good and the evil.